LCOV - code coverage report
Current view: top level - include/linux - sched.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 24 24 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       1             : #ifndef _LINUX_SCHED_H
       2             : #define _LINUX_SCHED_H
       3             : 
       4             : /*
       5             :  * cloning flags:
       6             :  */
       7             : #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
       8             : #define CLONE_VM        0x00000100      /* set if VM shared between processes */
       9             : #define CLONE_FS        0x00000200      /* set if fs info shared between processes */
      10             : #define CLONE_FILES     0x00000400      /* set if open files shared between processes */
      11             : #define CLONE_SIGHAND   0x00000800      /* set if signal handlers and blocked signals shared */
      12             : #define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
      13             : #define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
      14             : #define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
      15             : #define CLONE_THREAD    0x00010000      /* Same thread group? */
      16             : #define CLONE_NEWNS     0x00020000      /* New namespace group? */
      17             : #define CLONE_SYSVSEM   0x00040000      /* share system V SEM_UNDO semantics */
      18             : #define CLONE_SETTLS    0x00080000      /* create a new TLS for the child */
      19             : #define CLONE_PARENT_SETTID     0x00100000      /* set the TID in the parent */
      20             : #define CLONE_CHILD_CLEARTID    0x00200000      /* clear the TID in the child */
      21             : #define CLONE_DETACHED          0x00400000      /* Unused, ignored */
      22             : #define CLONE_UNTRACED          0x00800000      /* set if the tracing process can't force CLONE_PTRACE on this clone */
      23             : #define CLONE_CHILD_SETTID      0x01000000      /* set the TID in the child */
      24             : #define CLONE_STOPPED           0x02000000      /* Start in stopped state */
      25             : #define CLONE_NEWUTS            0x04000000      /* New utsname group? */
      26             : #define CLONE_NEWIPC            0x08000000      /* New ipcs */
      27             : #define CLONE_NEWUSER           0x10000000      /* New user namespace */
      28             : #define CLONE_NEWPID            0x20000000      /* New pid namespace */
      29             : #define CLONE_NEWNET            0x40000000      /* New network namespace */
      30             : #define CLONE_IO                0x80000000      /* Clone io context */
      31             : 
      32             : /*
      33             :  * Scheduling policies
      34             :  */
      35             : #define SCHED_NORMAL            0
      36             : #define SCHED_FIFO              1
      37             : #define SCHED_RR                2
      38             : #define SCHED_BATCH             3
      39             : /* SCHED_ISO: reserved but not implemented yet */
      40             : #define SCHED_IDLE              5
      41             : /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
      42             : #define SCHED_RESET_ON_FORK     0x40000000
      43             : 
      44             : #ifdef __KERNEL__
      45             : 
      46             : struct sched_param {
      47             :         int sched_priority;
      48             : };
      49             : 
      50             : #include <asm/param.h>    /* for HZ */
      51             : 
      52             : #include <linux/capability.h>
      53             : #include <linux/threads.h>
      54             : #include <linux/kernel.h>
      55             : #include <linux/types.h>
      56             : #include <linux/timex.h>
      57             : #include <linux/jiffies.h>
      58             : #include <linux/rbtree.h>
      59             : #include <linux/thread_info.h>
      60             : #include <linux/cpumask.h>
      61             : #include <linux/errno.h>
      62             : #include <linux/nodemask.h>
      63             : #include <linux/mm_types.h>
      64             : 
      65             : #include <asm/system.h>
      66             : #include <asm/page.h>
      67             : #include <asm/ptrace.h>
      68             : #include <asm/cputime.h>
      69             : 
      70             : #include <linux/smp.h>
      71             : #include <linux/sem.h>
      72             : #include <linux/signal.h>
      73             : #include <linux/path.h>
      74             : #include <linux/compiler.h>
      75             : #include <linux/completion.h>
      76             : #include <linux/pid.h>
      77             : #include <linux/percpu.h>
      78             : #include <linux/topology.h>
      79             : #include <linux/proportions.h>
      80             : #include <linux/seccomp.h>
      81             : #include <linux/rcupdate.h>
      82             : #include <linux/rculist.h>
      83             : #include <linux/rtmutex.h>
      84             : 
      85             : #include <linux/time.h>
      86             : #include <linux/param.h>
      87             : #include <linux/resource.h>
      88             : #include <linux/timer.h>
      89             : #include <linux/hrtimer.h>
      90             : #include <linux/task_io_accounting.h>
      91             : #include <linux/kobject.h>
      92             : #include <linux/latencytop.h>
      93             : #include <linux/cred.h>
      94             : 
      95             : #include <asm/processor.h>
      96             : 
      97             : struct exec_domain;
      98             : struct futex_pi_state;
      99             : struct robust_list_head;
     100             : struct bio;
     101             : struct fs_struct;
     102             : struct bts_context;
     103             : struct perf_event_context;
     104             : 
     105             : /*
     106             :  * List of flags we want to share for kernel threads,
     107             :  * if only because they are not used by them anyway.
     108             :  */
     109             : #define CLONE_KERNEL    (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
     110             : 
     111             : /*
     112             :  * These are the constant used to fake the fixed-point load-average
     113             :  * counting. Some notes:
     114             :  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
     115             :  *    a load-average precision of 10 bits integer + 11 bits fractional
     116             :  *  - if you want to count load-averages more often, you need more
     117             :  *    precision, or rounding will get you. With 2-second counting freq,
     118             :  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
     119             :  *    11 bit fractions.
     120             :  */
     121             : extern unsigned long avenrun[];         /* Load averages */
     122             : extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
     123             : 
     124             : #define FSHIFT          11              /* nr of bits of precision */
     125             : #define FIXED_1         (1<<FSHIFT)       /* 1.0 as fixed-point */
     126             : #define LOAD_FREQ       (5*HZ+1)        /* 5 sec intervals */
     127             : #define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
     128             : #define EXP_5           2014            /* 1/exp(5sec/5min) */
     129             : #define EXP_15          2037            /* 1/exp(5sec/15min) */
     130             : 
     131             : #define CALC_LOAD(load,exp,n) \
     132             :         load *= exp; \
     133             :         load += n*(FIXED_1-exp); \
     134             :         load >>= FSHIFT;
     135             : 
     136             : extern unsigned long total_forks;
     137             : extern int nr_threads;
     138             : DECLARE_PER_CPU(unsigned long, process_counts);
     139             : extern int nr_processes(void);
     140             : extern unsigned long nr_running(void);
     141             : extern unsigned long nr_uninterruptible(void);
     142             : extern unsigned long nr_iowait(void);
     143             : extern unsigned long nr_iowait_cpu(void);
     144             : extern unsigned long this_cpu_load(void);
     145             : 
     146             : 
     147             : extern void calc_global_load(void);
     148             : 
     149             : extern unsigned long get_parent_ip(unsigned long addr);
     150             : 
     151             : struct seq_file;
     152             : struct cfs_rq;
     153             : struct task_group;
     154             : #ifdef CONFIG_SCHED_DEBUG
     155             : extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
     156             : extern void proc_sched_set_task(struct task_struct *p);
     157             : extern void
     158             : print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
     159             : #else
     160             : static inline void
     161             : proc_sched_show_task(struct task_struct *p, struct seq_file *m)
     162             : {
     163             : }
     164             : static inline void proc_sched_set_task(struct task_struct *p)
     165             : {
     166             : }
     167             : static inline void
     168             : print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
     169             : {
     170             : }
     171             : #endif
     172             : 
     173             : /*
     174             :  * Task state bitmask. NOTE! These bits are also
     175             :  * encoded in fs/proc/array.c: get_task_state().
     176             :  *
     177             :  * We have two separate sets of flags: task->state
     178             :  * is about runnability, while task->exit_state are
     179             :  * about the task exiting. Confusing, but this way
     180             :  * modifying one set can't modify the other one by
     181             :  * mistake.
     182             :  */
     183             : #define TASK_RUNNING            0
     184             : #define TASK_INTERRUPTIBLE      1
     185             : #define TASK_UNINTERRUPTIBLE    2
     186             : #define __TASK_STOPPED          4
     187             : #define __TASK_TRACED           8
     188             : /* in tsk->exit_state */
     189             : #define EXIT_ZOMBIE             16
     190             : #define EXIT_DEAD               32
     191             : /* in tsk->state again */
     192             : #define TASK_DEAD               64
     193             : #define TASK_WAKEKILL           128
     194             : #define TASK_WAKING             256
     195             : #define TASK_STATE_MAX          512
     196             : 
     197             : #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
     198             : 
     199             : extern char ___assert_task_state[1 - 2*!!(
     200             :                 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
     201             : 
     202             : /* Convenience macros for the sake of set_task_state */
     203             : #define TASK_KILLABLE           (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
     204             : #define TASK_STOPPED            (TASK_WAKEKILL | __TASK_STOPPED)
     205             : #define TASK_TRACED             (TASK_WAKEKILL | __TASK_TRACED)
     206             : 
     207             : /* Convenience macros for the sake of wake_up */
     208             : #define TASK_NORMAL             (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
     209             : #define TASK_ALL                (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
     210             : 
     211             : /* get_task_state() */
     212             : #define TASK_REPORT             (TASK_RUNNING | TASK_INTERRUPTIBLE | \
     213             :                                  TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
     214             :                                  __TASK_TRACED)
     215             : 
     216             : #define task_is_traced(task)    ((task->state & __TASK_TRACED) != 0)
     217             : #define task_is_stopped(task)   ((task->state & __TASK_STOPPED) != 0)
     218             : #define task_is_stopped_or_traced(task) \
     219             :                         ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
     220             : #define task_contributes_to_load(task)  \
     221             :                                 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
     222             :                                  (task->flags & PF_FREEZING) == 0)
     223             : 
     224             : #define __set_task_state(tsk, state_value)              \
     225             :         do { (tsk)->state = (state_value); } while (0)
     226             : #define set_task_state(tsk, state_value)                \
     227             :         set_mb((tsk)->state, (state_value))
     228             : 
     229             : /*
     230             :  * set_current_state() includes a barrier so that the write of current->state
     231             :  * is correctly serialised wrt the caller's subsequent test of whether to
     232             :  * actually sleep:
     233             :  *
     234             :  *      set_current_state(TASK_UNINTERRUPTIBLE);
     235             :  *      if (do_i_need_to_sleep())
     236             :  *              schedule();
     237             :  *
     238             :  * If the caller does not need such serialisation then use __set_current_state()
     239             :  */
     240             : #define __set_current_state(state_value)                        \
     241             :         do { current->state = (state_value); } while (0)
     242             : #define set_current_state(state_value)          \
     243             :         set_mb(current->state, (state_value))
     244             : 
     245             : /* Task command name length */
     246             : #define TASK_COMM_LEN 16
     247             : 
     248             : #include <linux/spinlock.h>
     249             : 
     250             : /*
     251             :  * This serializes "schedule()" and also protects
     252             :  * the run-queue from deletions/modifications (but
     253             :  * _adding_ to the beginning of the run-queue has
     254             :  * a separate lock).
     255             :  */
     256             : extern rwlock_t tasklist_lock;
     257             : extern spinlock_t mmlist_lock;
     258             : 
     259             : struct task_struct;
     260             : 
     261             : extern void sched_init(void);
     262             : extern void sched_init_smp(void);
     263             : extern asmlinkage void schedule_tail(struct task_struct *prev);
     264             : extern void init_idle(struct task_struct *idle, int cpu);
     265             : extern void init_idle_bootup_task(struct task_struct *idle);
     266             : 
     267             : extern int runqueue_is_locked(int cpu);
     268             : extern void task_rq_unlock_wait(struct task_struct *p);
     269             : 
     270             : extern cpumask_var_t nohz_cpu_mask;
     271             : #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
     272             : extern int select_nohz_load_balancer(int cpu);
     273             : extern int get_nohz_load_balancer(void);
     274             : #else
     275             : static inline int select_nohz_load_balancer(int cpu)
     276             : {
     277             :         return 0;
     278             : }
     279             : #endif
     280             : 
     281             : /*
     282             :  * Only dump TASK_* tasks. (0 for all tasks)
     283             :  */
     284             : extern void show_state_filter(unsigned long state_filter);
     285             : 
     286             : static inline void show_state(void)
     287             : {
     288             :         show_state_filter(0);
     289             : }
     290             : 
     291             : extern void show_regs(struct pt_regs *);
     292             : 
     293             : /*
     294             :  * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
     295             :  * task), SP is the stack pointer of the first frame that should be shown in the back
     296             :  * trace (or NULL if the entire call-chain of the task should be shown).
     297             :  */
     298             : extern void show_stack(struct task_struct *task, unsigned long *sp);
     299             : 
     300             : void io_schedule(void);
     301             : long io_schedule_timeout(long timeout);
     302             : 
     303             : extern void cpu_init (void);
     304             : extern void trap_init(void);
     305             : extern void update_process_times(int user);
     306             : extern void scheduler_tick(void);
     307             : 
     308             : extern void sched_show_task(struct task_struct *p);
     309             : 
     310             : #ifdef CONFIG_DETECT_SOFTLOCKUP
     311             : extern void softlockup_tick(void);
     312             : extern void touch_softlockup_watchdog(void);
     313             : extern void touch_softlockup_watchdog_sync(void);
     314             : extern void touch_all_softlockup_watchdogs(void);
     315             : extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
     316             :                                     void __user *buffer,
     317             :                                     size_t *lenp, loff_t *ppos);
     318             : extern unsigned int  softlockup_panic;
     319             : extern int softlockup_thresh;
     320             : #else
     321             : static inline void softlockup_tick(void)
     322             : {
     323             : }
     324             : static inline void touch_softlockup_watchdog(void)
     325             : {
     326             : }
     327             : static inline void touch_softlockup_watchdog_sync(void)
     328             : {
     329             : }
     330             : static inline void touch_all_softlockup_watchdogs(void)
     331             : {
     332             : }
     333             : #endif
     334             : 
     335             : #ifdef CONFIG_DETECT_HUNG_TASK
     336             : extern unsigned int  sysctl_hung_task_panic;
     337             : extern unsigned long sysctl_hung_task_check_count;
     338             : extern unsigned long sysctl_hung_task_timeout_secs;
     339             : extern unsigned long sysctl_hung_task_warnings;
     340             : extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
     341             :                                          void __user *buffer,
     342             :                                          size_t *lenp, loff_t *ppos);
     343             : #endif
     344             : 
     345             : /* Attach to any functions which should be ignored in wchan output. */
     346             : #define __sched         __attribute__((__section__(".sched.text")))
     347             : 
     348             : /* Linker adds these: start and end of __sched functions */
     349             : extern char __sched_text_start[], __sched_text_end[];
     350             : 
     351             : /* Is this address in the __sched functions? */
     352             : extern int in_sched_functions(unsigned long addr);
     353             : 
     354             : #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
     355             : extern signed long schedule_timeout(signed long timeout);
     356             : extern signed long schedule_timeout_interruptible(signed long timeout);
     357             : extern signed long schedule_timeout_killable(signed long timeout);
     358             : extern signed long schedule_timeout_uninterruptible(signed long timeout);
     359             : asmlinkage void schedule(void);
     360             : extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
     361           1 : 
     362             : struct nsproxy;
     363             : struct user_namespace;
     364             : 
     365             : /*
     366             :  * Default maximum number of active map areas, this limits the number of vmas
     367             :  * per mm struct. Users can overwrite this number by sysctl but there is a
     368             :  * problem.
     369             :  *
     370             :  * When a program's coredump is generated as ELF format, a section is created
     371             :  * per a vma. In ELF, the number of sections is represented in unsigned short.
     372             :  * This means the number of sections should be smaller than 65535 at coredump.
     373             :  * Because the kernel adds some informative sections to a image of program at
     374             :  * generating coredump, we need some margin. The number of extra sections is
     375             :  * 1-3 now and depends on arch. We use "5" as safe margin, here.
     376             :  */
     377             : #define MAPCOUNT_ELF_CORE_MARGIN        (5)
     378             : #define DEFAULT_MAX_MAP_COUNT   (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
     379             : 
     380             : extern int sysctl_max_map_count;
     381             : 
     382             : #include <linux/aio.h>
     383             : 
     384             : #ifdef CONFIG_MMU
     385             : extern void arch_pick_mmap_layout(struct mm_struct *mm);
     386             : extern unsigned long
     387             : arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
     388             :                        unsigned long, unsigned long);
     389             : extern unsigned long
     390             : arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
     391             :                           unsigned long len, unsigned long pgoff,
     392             :                           unsigned long flags);
     393             : extern void arch_unmap_area(struct mm_struct *, unsigned long);
     394             : extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
     395             : #else
     396             : static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
     397             : #endif
     398             : 
     399             : #if USE_SPLIT_PTLOCKS
     400             : /*
     401             :  * The mm counters are not protected by its page_table_lock,
     402             :  * so must be incremented atomically.
     403             :  */
     404             : #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
     405             : #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
     406             : #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
     407             : #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
     408             : #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
     409             : 
     410             : #else  /* !USE_SPLIT_PTLOCKS */
     411             : /*
     412             :  * The mm counters are protected by its page_table_lock,
     413             :  * so can be incremented directly.
     414             :  */
     415             : #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
     416             : #define get_mm_counter(mm, member) ((mm)->_##member)
     417             : #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
     418             : #define inc_mm_counter(mm, member) (mm)->_##member++
     419             : #define dec_mm_counter(mm, member) (mm)->_##member--
     420             : 
     421             : #endif /* !USE_SPLIT_PTLOCKS */
     422             : 
     423             : #define get_mm_rss(mm)                                  \
     424             :         (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
     425             : #define update_hiwater_rss(mm)  do {                    \
     426             :         unsigned long _rss = get_mm_rss(mm);            \
     427             :         if ((mm)->hiwater_rss < _rss)                     \
     428             :                 (mm)->hiwater_rss = _rss;            \
     429             : } while (0)
     430             : #define update_hiwater_vm(mm)   do {                    \
     431             :         if ((mm)->hiwater_vm < (mm)->total_vm)         \
     432             :                 (mm)->hiwater_vm = (mm)->total_vm;        \
     433             : } while (0)
     434             : 
     435             : static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
     436             : {
     437             :         return max(mm->hiwater_rss, get_mm_rss(mm));
     438             : }
     439             : 
     440             : static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
     441             :                                          struct mm_struct *mm)
     442             : {
     443             :         unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
     444             : 
     445             :         if (*maxrss < hiwater_rss)
     446             :                 *maxrss = hiwater_rss;
     447             : }
     448             : 
     449             : static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
     450             : {
     451             :         return max(mm->hiwater_vm, mm->total_vm);
     452             : }
     453             : 
     454             : extern void set_dumpable(struct mm_struct *mm, int value);
     455             : extern int get_dumpable(struct mm_struct *mm);
     456           1 : 
     457             : /* mm flags */
     458             : /* dumpable bits */
     459             : #define MMF_DUMPABLE      0  /* core dump is permitted */
     460             : #define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
     461             : 
     462             : #define MMF_DUMPABLE_BITS 2
     463             : #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
     464             : 
     465             : /* coredump filter bits */
     466             : #define MMF_DUMP_ANON_PRIVATE   2
     467             : #define MMF_DUMP_ANON_SHARED    3
     468             : #define MMF_DUMP_MAPPED_PRIVATE 4
     469             : #define MMF_DUMP_MAPPED_SHARED  5
     470             : #define MMF_DUMP_ELF_HEADERS    6
     471             : #define MMF_DUMP_HUGETLB_PRIVATE 7
     472             : #define MMF_DUMP_HUGETLB_SHARED  8
     473             : 
     474             : #define MMF_DUMP_FILTER_SHIFT   MMF_DUMPABLE_BITS
     475             : #define MMF_DUMP_FILTER_BITS    7
     476             : #define MMF_DUMP_FILTER_MASK \
     477             :         (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
     478             : #define MMF_DUMP_FILTER_DEFAULT \
     479             :         ((1 << MMF_DUMP_ANON_PRIVATE) |   (1 << MMF_DUMP_ANON_SHARED) |\
     480             :          (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
     481             : 
     482             : #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
     483             : # define MMF_DUMP_MASK_DEFAULT_ELF      (1 << MMF_DUMP_ELF_HEADERS)
     484             : #else
     485             : # define MMF_DUMP_MASK_DEFAULT_ELF      0
     486             : #endif
     487             :                                         /* leave room for more dump flags */
     488             : #define MMF_VM_MERGEABLE        16      /* KSM may merge identical pages */
     489             : 
     490             : #define MMF_INIT_MASK           (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
     491             : 
     492             : struct sighand_struct {
     493             :         atomic_t                count;
     494             :         struct k_sigaction      action[_NSIG];
     495             :         spinlock_t              siglock;
     496             :         wait_queue_head_t       signalfd_wqh;
     497             : };
     498             : 
     499             : struct pacct_struct {
     500             :         int                     ac_flag;
     501             :         long                    ac_exitcode;
     502             :         unsigned long           ac_mem;
     503             :         cputime_t               ac_utime, ac_stime;
     504             :         unsigned long           ac_minflt, ac_majflt;
     505             : };
     506           1 : 
     507             : struct cpu_itimer {
     508             :         cputime_t expires;
     509             :         cputime_t incr;
     510             :         u32 error;
     511             :         u32 incr_error;
     512             : };
     513           1 : 
     514             : /**
     515             :  * struct task_cputime - collected CPU time counts
     516             :  * @utime:              time spent in user mode, in &cputime_t units
     517             :  * @stime:              time spent in kernel mode, in &cputime_t units
     518             :  * @sum_exec_runtime:   total time spent on the CPU, in nanoseconds
     519             :  *
     520             :  * This structure groups together three kinds of CPU time that are
     521             :  * tracked for threads and thread groups.  Most things considering
     522             :  * CPU time want to group these counts together and treat all three
     523             :  * of them in parallel.
     524             :  */
     525             : struct task_cputime {
     526             :         cputime_t utime;
     527             :         cputime_t stime;
     528             :         unsigned long long sum_exec_runtime;
     529             : };
     530           1 : /* Alternate field names when used to cache expirations. */
     531             : #define prof_exp        stime
     532             : #define virt_exp        utime
     533             : #define sched_exp       sum_exec_runtime
     534             : 
     535             : #define INIT_CPUTIME    \
     536             :         (struct task_cputime) {                                 \
     537             :                 .utime = cputime_zero,                          \
     538             :                 .stime = cputime_zero,                          \
     539             :                 .sum_exec_runtime = 0,                          \
     540             :         }
     541             : 
     542             : /*
     543             :  * Disable preemption until the scheduler is running.
     544             :  * Reset by start_kernel()->sched_init()->init_idle().
     545             :  *
     546             :  * We include PREEMPT_ACTIVE to avoid cond_resched() from working
     547             :  * before the scheduler is active -- see should_resched().
     548             :  */
     549             : #define INIT_PREEMPT_COUNT      (1 + PREEMPT_ACTIVE)
     550             : 
     551             : /**
     552             :  * struct thread_group_cputimer - thread group interval timer counts
     553             :  * @cputime:            thread group interval timers.
     554             :  * @running:            non-zero when there are timers running and
     555             :  *                      @cputime receives updates.
     556             :  * @lock:               lock for fields in this struct.
     557             :  *
     558             :  * This structure contains the version of task_cputime, above, that is
     559             :  * used for thread group CPU timer calculations.
     560             :  */
     561             : struct thread_group_cputimer {
     562             :         struct task_cputime cputime;
     563             :         int running;
     564             :         spinlock_t lock;
     565             : };
     566           2 : 
     567             : /*
     568             :  * NOTE! "signal_struct" does not have it's own
     569             :  * locking, because a shared signal_struct always
     570             :  * implies a shared sighand_struct, so locking
     571             :  * sighand_struct is always a proper superset of
     572             :  * the locking of signal_struct.
     573             :  */
     574             : struct signal_struct {
     575             :         atomic_t                count;
     576             :         atomic_t                live;
     577             : 
     578             :         wait_queue_head_t       wait_chldexit;  /* for wait4() */
     579             : 
     580             :         /* current thread group signal load-balancing target: */
     581             :         struct task_struct      *curr_target;
     582             : 
     583             :         /* shared signal handling: */
     584             :         struct sigpending       shared_pending;
     585             : 
     586             :         /* thread group exit support */
     587             :         int                     group_exit_code;
     588             :         /* overloaded:
     589             :          * - notify group_exit_task when ->count is equal to notify_count
     590             :          * - everyone except group_exit_task is stopped during signal delivery
     591             :          *   of fatal signals, group_exit_task processes the signal.
     592             :          */
     593             :         int                     notify_count;
     594             :         struct task_struct      *group_exit_task;
     595             : 
     596             :         /* thread group stop support, overloads group_exit_code too */
     597             :         int                     group_stop_count;
     598             :         unsigned int            flags; /* see SIGNAL_* flags below */
     599             : 
     600             :         /* POSIX.1b Interval Timers */
     601             :         struct list_head posix_timers;
     602             : 
     603             :         /* ITIMER_REAL timer for the process */
     604             :         struct hrtimer real_timer;
     605             :         struct pid *leader_pid;
     606             :         ktime_t it_real_incr;
     607             : 
     608             :         /*
     609             :          * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
     610             :          * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
     611             :          * values are defined to 0 and 1 respectively
     612             :          */
     613             :         struct cpu_itimer it[2];
     614             : 
     615             :         /*
     616             :          * Thread group totals for process CPU timers.
     617             :          * See thread_group_cputimer(), et al, for details.
     618             :          */
     619             :         struct thread_group_cputimer cputimer;
     620             : 
     621             :         /* Earliest-expiration cache. */
     622             :         struct task_cputime cputime_expires;
     623             : 
     624             :         struct list_head cpu_timers[3];
     625             : 
     626             :         struct pid *tty_old_pgrp;
     627             : 
     628             :         /* boolean value for session group leader */
     629             :         int leader;
     630             : 
     631             :         struct tty_struct *tty; /* NULL if no tty */
     632             : 
     633             :         /*
     634             :          * Cumulative resource counters for dead threads in the group,
     635             :          * and for reaped dead child processes forked by this group.
     636             :          * Live threads maintain their own counters and add to these
     637             :          * in __exit_signal, except for the group leader.
     638             :          */
     639             :         cputime_t utime, stime, cutime, cstime;
     640             :         cputime_t gtime;
     641             :         cputime_t cgtime;
     642             : #ifndef CONFIG_VIRT_CPU_ACCOUNTING
     643             :         cputime_t prev_utime, prev_stime;
     644             : #endif
     645             :         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
     646             :         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
     647             :         unsigned long inblock, oublock, cinblock, coublock;
     648             :         unsigned long maxrss, cmaxrss;
     649             :         struct task_io_accounting ioac;
     650             : 
     651             :         /*
     652             :          * Cumulative ns of schedule CPU time fo dead threads in the
     653             :          * group, not including a zombie group leader, (This only differs
     654             :          * from jiffies_to_ns(utime + stime) if sched_clock uses something
     655             :          * other than jiffies.)
     656             :          */
     657             :         unsigned long long sum_sched_runtime;
     658             : 
     659             :         /*
     660             :          * We don't bother to synchronize most readers of this at all,
     661             :          * because there is no reader checking a limit that actually needs
     662             :          * to get both rlim_cur and rlim_max atomically, and either one
     663             :          * alone is a single word that can safely be read normally.
     664             :          * getrlimit/setrlimit use task_lock(current->group_leader) to
     665             :          * protect this instead of the siglock, because they really
     666             :          * have no need to disable irqs.
     667             :          */
     668             :         struct rlimit rlim[RLIM_NLIMITS];
     669             : 
     670             : #ifdef CONFIG_BSD_PROCESS_ACCT
     671             :         struct pacct_struct pacct;      /* per-process accounting information */
     672             : #endif
     673             : #ifdef CONFIG_TASKSTATS
     674             :         struct taskstats *stats;
     675             : #endif
     676             : #ifdef CONFIG_AUDIT
     677             :         unsigned audit_tty;
     678             :         struct tty_audit_buf *tty_audit_buf;
     679             : #endif
     680             : 
     681             :         int oom_adj;    /* OOM kill score adjustment (bit shift) */
     682             : };
     683             : 
     684             : /* Context switch must be unlocked if interrupts are to be enabled */
     685             : #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
     686             : # define __ARCH_WANT_UNLOCKED_CTXSW
     687             : #endif
     688             : 
     689             : /*
     690             :  * Bits in flags field of signal_struct.
     691             :  */
     692             : #define SIGNAL_STOP_STOPPED     0x00000001 /* job control stop in effect */
     693             : #define SIGNAL_STOP_DEQUEUED    0x00000002 /* stop signal dequeued */
     694             : #define SIGNAL_STOP_CONTINUED   0x00000004 /* SIGCONT since WCONTINUED reap */
     695             : #define SIGNAL_GROUP_EXIT       0x00000008 /* group exit in progress */
     696             : /*
     697             :  * Pending notifications to parent.
     698             :  */
     699             : #define SIGNAL_CLD_STOPPED      0x00000010
     700             : #define SIGNAL_CLD_CONTINUED    0x00000020
     701             : #define SIGNAL_CLD_MASK         (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
     702             : 
     703             : #define SIGNAL_UNKILLABLE       0x00000040 /* for init: ignore fatal signals */
     704             : 
     705             : /* If true, all threads except ->group_exit_task have pending SIGKILL */
     706             : static inline int signal_group_exit(const struct signal_struct *sig)
     707             : {
     708             :         return  (sig->flags & SIGNAL_GROUP_EXIT) ||
     709             :                 (sig->group_exit_task != NULL);
     710             : }
     711           1 : 
     712             : /*
     713             :  * Some day this will be a full-fledged user tracking system..
     714             :  */
     715             : struct user_struct {
     716             :         atomic_t __count;       /* reference count */
     717             :         atomic_t processes;     /* How many processes does this user have? */
     718             :         atomic_t files;         /* How many open files does this user have? */
     719             :         atomic_t sigpending;    /* How many pending signals does this user have? */
     720             : #ifdef CONFIG_INOTIFY_USER
     721             :         atomic_t inotify_watches; /* How many inotify watches does this user have? */
     722             :         atomic_t inotify_devs;  /* How many inotify devs does this user have opened? */
     723             : #endif
     724             : #ifdef CONFIG_EPOLL
     725             :         atomic_t epoll_watches; /* The number of file descriptors currently watched */
     726             : #endif
     727             : #ifdef CONFIG_POSIX_MQUEUE
     728             :         /* protected by mq_lock */
     729             :         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
     730             : #endif
     731             :         unsigned long locked_shm; /* How many pages of mlocked shm ? */
     732             : 
     733             : #ifdef CONFIG_KEYS
     734             :         struct key *uid_keyring;        /* UID specific keyring */
     735             :         struct key *session_keyring;    /* UID's default session keyring */
     736             : #endif
     737             : 
     738             :         /* Hash table maintenance information */
     739             :         struct hlist_node uidhash_node;
     740             :         uid_t uid;
     741             :         struct user_namespace *user_ns;
     742             : 
     743             : #ifdef CONFIG_USER_SCHED
     744             :         struct task_group *tg;
     745             : #ifdef CONFIG_SYSFS
     746             :         struct kobject kobj;
     747             :         struct delayed_work work;
     748             : #endif
     749             : #endif
     750             : 
     751             : #ifdef CONFIG_PERF_EVENTS
     752             :         atomic_long_t locked_vm;
     753             : #endif
     754             : };
     755             : 
     756             : extern int uids_sysfs_init(void);
     757             : 
     758             : extern struct user_struct *find_user(uid_t);
     759             : 
     760             : extern struct user_struct root_user;
     761           1 : #define INIT_USER (&root_user)
     762             : 
     763             : 
     764             : struct backing_dev_info;
     765             : struct reclaim_state;
     766             : 
     767             : #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
     768             : struct sched_info {
     769             :         /* cumulative counters */
     770             :         unsigned long pcount;         /* # of times run on this cpu */
     771             :         unsigned long long run_delay; /* time spent waiting on a runqueue */
     772             : 
     773             :         /* timestamps */
     774             :         unsigned long long last_arrival,/* when we last ran on a cpu */
     775             :                            last_queued; /* when we were last queued to run */
     776             : #ifdef CONFIG_SCHEDSTATS
     777             :         /* BKL stats */
     778             :         unsigned int bkl_count;
     779             : #endif
     780             : };
     781             : #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
     782             : 
     783             : #ifdef CONFIG_TASK_DELAY_ACCT
     784             : struct task_delay_info {
     785             :         spinlock_t      lock;
     786             :         unsigned int    flags;  /* Private per-task flags */
     787             : 
     788             :         /* For each stat XXX, add following, aligned appropriately
     789             :          *
     790             :          * struct timespec XXX_start, XXX_end;
     791             :          * u64 XXX_delay;
     792             :          * u32 XXX_count;
     793             :          *
     794             :          * Atomicity of updates to XXX_delay, XXX_count protected by
     795             :          * single lock above (split into XXX_lock if contention is an issue).
     796             :          */
     797             : 
     798             :         /*
     799             :          * XXX_count is incremented on every XXX operation, the delay
     800             :          * associated with the operation is added to XXX_delay.
     801             :          * XXX_delay contains the accumulated delay time in nanoseconds.
     802             :          */
     803             :         struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
     804             :         u64 blkio_delay;        /* wait for sync block io completion */
     805             :         u64 swapin_delay;       /* wait for swapin block io completion */
     806             :         u32 blkio_count;        /* total count of the number of sync block */
     807             :                                 /* io operations performed */
     808             :         u32 swapin_count;       /* total count of the number of swapin block */
     809             :                                 /* io operations performed */
     810             : 
     811             :         struct timespec freepages_start, freepages_end;
     812             :         u64 freepages_delay;    /* wait for memory reclaim */
     813             :         u32 freepages_count;    /* total count of memory reclaim */
     814             : };
     815             : #endif  /* CONFIG_TASK_DELAY_ACCT */
     816             : 
     817             : static inline int sched_info_on(void)
     818             : {
     819             : #ifdef CONFIG_SCHEDSTATS
     820             :         return 1;
     821             : #elif defined(CONFIG_TASK_DELAY_ACCT)
     822             :         extern int delayacct_on;
     823             :         return delayacct_on;
     824             : #else
     825             :         return 0;
     826             : #endif
     827           1 : }
     828             : 
     829             : enum cpu_idle_type {
     830             :         CPU_IDLE,
     831             :         CPU_NOT_IDLE,
     832             :         CPU_NEWLY_IDLE,
     833             :         CPU_MAX_IDLE_TYPES
     834             : };
     835             : 
     836             : /*
     837             :  * sched-domains (multiprocessor balancing) declarations:
     838             :  */
     839             : 
     840             : /*
     841             :  * Increase resolution of nice-level calculations:
     842             :  */
     843             : #define SCHED_LOAD_SHIFT        10
     844             : #define SCHED_LOAD_SCALE        (1L << SCHED_LOAD_SHIFT)
     845             : 
     846             : #define SCHED_LOAD_SCALE_FUZZ   SCHED_LOAD_SCALE
     847             : 
     848             : #ifdef CONFIG_SMP
     849             : #define SD_LOAD_BALANCE         0x0001  /* Do load balancing on this domain. */
     850             : #define SD_BALANCE_NEWIDLE      0x0002  /* Balance when about to become idle */
     851             : #define SD_BALANCE_EXEC         0x0004  /* Balance on exec */
     852             : #define SD_BALANCE_FORK         0x0008  /* Balance on fork, clone */
     853             : #define SD_BALANCE_WAKE         0x0010  /* Balance on wakeup */
     854             : #define SD_WAKE_AFFINE          0x0020  /* Wake task to waking CPU */
     855             : #define SD_PREFER_LOCAL         0x0040  /* Prefer to keep tasks local to this domain */
     856             : #define SD_SHARE_CPUPOWER       0x0080  /* Domain members share cpu power */
     857             : #define SD_POWERSAVINGS_BALANCE 0x0100  /* Balance for power savings */
     858             : #define SD_SHARE_PKG_RESOURCES  0x0200  /* Domain members share cpu pkg resources */
     859             : #define SD_SERIALIZE            0x0400  /* Only a single load balancing instance */
     860             : 
     861             : #define SD_PREFER_SIBLING       0x1000  /* Prefer to place tasks in a sibling domain */
     862             : 
     863             : enum powersavings_balance_level {
     864             :         POWERSAVINGS_BALANCE_NONE = 0,  /* No power saving load balance */
     865             :         POWERSAVINGS_BALANCE_BASIC,     /* Fill one thread/core/package
     866             :                                          * first for long running threads
     867             :                                          */
     868             :         POWERSAVINGS_BALANCE_WAKEUP,    /* Also bias task wakeups to semi-idle
     869             :                                          * cpu package for power savings
     870             :                                          */
     871             :         MAX_POWERSAVINGS_BALANCE_LEVELS
     872             : };
     873             : 
     874             : extern int sched_mc_power_savings, sched_smt_power_savings;
     875             : 
     876             : static inline int sd_balance_for_mc_power(void)
     877             : {
     878             :         if (sched_smt_power_savings)
     879             :                 return SD_POWERSAVINGS_BALANCE;
     880             : 
     881             :         if (!sched_mc_power_savings)
     882             :                 return SD_PREFER_SIBLING;
     883             : 
     884             :         return 0;
     885             : }
     886             : 
     887             : static inline int sd_balance_for_package_power(void)
     888             : {
     889             :         if (sched_mc_power_savings | sched_smt_power_savings)
     890             :                 return SD_POWERSAVINGS_BALANCE;
     891             : 
     892             :         return SD_PREFER_SIBLING;
     893             : }
     894             : 
     895             : /*
     896             :  * Optimise SD flags for power savings:
     897             :  * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
     898             :  * Keep default SD flags if sched_{smt,mc}_power_saving=0
     899             :  */
     900             : 
     901             : static inline int sd_power_saving_flags(void)
     902             : {
     903             :         if (sched_mc_power_savings | sched_smt_power_savings)
     904             :                 return SD_BALANCE_NEWIDLE;
     905             : 
     906             :         return 0;
     907             : }
     908           1 : 
     909             : struct sched_group {
     910             :         struct sched_group *next;       /* Must be a circular list */
     911             : 
     912             :         /*
     913             :          * CPU power of this group, SCHED_LOAD_SCALE being max power for a
     914             :          * single CPU.
     915             :          */
     916             :         unsigned int cpu_power;
     917             : 
     918             :         /*
     919             :          * The CPUs this group covers.
     920             :          *
     921             :          * NOTE: this field is variable length. (Allocated dynamically
     922             :          * by attaching extra space to the end of the structure,
     923             :          * depending on how many CPUs the kernel has booted up with)
     924             :          *
     925             :          * It is also be embedded into static data structures at build
     926             :          * time. (See 'struct static_sched_group' in kernel/sched.c)
     927             :          */
     928             :         unsigned long cpumask[0];
     929             : };
     930             : 
     931             : static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
     932             : {
     933             :         return to_cpumask(sg->cpumask);
     934             : }
     935           1 : 
     936             : enum sched_domain_level {
     937             :         SD_LV_NONE = 0,
     938             :         SD_LV_SIBLING,
     939             :         SD_LV_MC,
     940             :         SD_LV_CPU,
     941             :         SD_LV_NODE,
     942             :         SD_LV_ALLNODES,
     943             :         SD_LV_MAX
     944             : };
     945             : 
     946             : struct sched_domain_attr {
     947             :         int relax_domain_level;
     948             : };
     949           1 : 
     950             : #define SD_ATTR_INIT    (struct sched_domain_attr) {    \
     951             :         .relax_domain_level = -1,                       \
     952             : }
     953             : 
     954             : struct sched_domain {
     955             :         /* These fields must be setup */
     956             :         struct sched_domain *parent;    /* top domain must be null terminated */
     957             :         struct sched_domain *child;     /* bottom domain must be null terminated */
     958             :         struct sched_group *groups;     /* the balancing groups of the domain */
     959             :         unsigned long min_interval;     /* Minimum balance interval ms */
     960             :         unsigned long max_interval;     /* Maximum balance interval ms */
     961             :         unsigned int busy_factor;       /* less balancing by factor if busy */
     962             :         unsigned int imbalance_pct;     /* No balance until over watermark */
     963             :         unsigned int cache_nice_tries;  /* Leave cache hot tasks for # tries */
     964             :         unsigned int busy_idx;
     965             :         unsigned int idle_idx;
     966             :         unsigned int newidle_idx;
     967             :         unsigned int wake_idx;
     968             :         unsigned int forkexec_idx;
     969             :         unsigned int smt_gain;
     970             :         int flags;                      /* See SD_* */
     971             :         enum sched_domain_level level;
     972             : 
     973             :         /* Runtime fields. */
     974             :         unsigned long last_balance;     /* init to jiffies. units in jiffies */
     975             :         unsigned int balance_interval;  /* initialise to 1. units in ms. */
     976             :         unsigned int nr_balance_failed; /* initialise to 0 */
     977             : 
     978             :         u64 last_update;
     979             : 
     980             : #ifdef CONFIG_SCHEDSTATS
     981             :         /* load_balance() stats */
     982             :         unsigned int lb_count[CPU_MAX_IDLE_TYPES];
     983             :         unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
     984             :         unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
     985             :         unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
     986             :         unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
     987             :         unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
     988             :         unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
     989             :         unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
     990             : 
     991             :         /* Active load balancing */
     992             :         unsigned int alb_count;
     993             :         unsigned int alb_failed;
     994             :         unsigned int alb_pushed;
     995             : 
     996             :         /* SD_BALANCE_EXEC stats */
     997             :         unsigned int sbe_count;
     998             :         unsigned int sbe_balanced;
     999             :         unsigned int sbe_pushed;
    1000             : 
    1001             :         /* SD_BALANCE_FORK stats */
    1002             :         unsigned int sbf_count;
    1003             :         unsigned int sbf_balanced;
    1004             :         unsigned int sbf_pushed;
    1005             : 
    1006             :         /* try_to_wake_up() stats */
    1007             :         unsigned int ttwu_wake_remote;
    1008             :         unsigned int ttwu_move_affine;
    1009             :         unsigned int ttwu_move_balance;
    1010             : #endif
    1011             : #ifdef CONFIG_SCHED_DEBUG
    1012             :         char *name;
    1013             : #endif
    1014             : 
    1015             :         /*
    1016             :          * Span of all CPUs in this domain.
    1017             :          *
    1018             :          * NOTE: this field is variable length. (Allocated dynamically
    1019             :          * by attaching extra space to the end of the structure,
    1020             :          * depending on how many CPUs the kernel has booted up with)
    1021             :          *
    1022             :          * It is also be embedded into static data structures at build
    1023             :          * time. (See 'struct static_sched_domain' in kernel/sched.c)
    1024             :          */
    1025             :         unsigned long span[0];
    1026             : };
    1027             : 
    1028             : static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
    1029             : {
    1030             :         return to_cpumask(sd->span);
    1031             : }
    1032             : 
    1033             : extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
    1034             :                                     struct sched_domain_attr *dattr_new);
    1035             : 
    1036             : /* Allocate an array of sched domains, for partition_sched_domains(). */
    1037             : cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
    1038             : void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
    1039             : 
    1040             : /* Test a flag in parent sched domain */
    1041             : static inline int test_sd_parent(struct sched_domain *sd, int flag)
    1042             : {
    1043             :         if (sd->parent && (sd->parent->flags & flag))
    1044             :                 return 1;
    1045             : 
    1046             :         return 0;
    1047             : }
    1048             : 
    1049             : unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
    1050             : unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
    1051           1 : 
    1052             : #else /* CONFIG_SMP */
    1053             : 
    1054             : struct sched_domain_attr;
    1055             : 
    1056             : static inline void
    1057             : partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
    1058             :                         struct sched_domain_attr *dattr_new)
    1059             : {
    1060             : }
    1061             : #endif  /* !CONFIG_SMP */
    1062             : 
    1063             : 
    1064             : struct io_context;                      /* See blkdev.h */
    1065             : 
    1066             : 
    1067             : #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
    1068             : extern void prefetch_stack(struct task_struct *t);
    1069             : #else
    1070             : static inline void prefetch_stack(struct task_struct *t) { }
    1071             : #endif
    1072             : 
    1073             : struct audit_context;           /* See audit.c */
    1074           1 : struct mempolicy;
    1075           1 : struct pipe_inode_info;
    1076             : struct uts_namespace;
    1077             : 
    1078             : struct rq;
    1079             : struct sched_domain;
    1080             : 
    1081             : /*
    1082             :  * wake flags
    1083             :  */
    1084             : #define WF_SYNC         0x01            /* waker goes to sleep after wakup */
    1085             : #define WF_FORK         0x02            /* child wakeup after fork */
    1086             : 
    1087             : struct sched_class {
    1088             :         const struct sched_class *next;
    1089             : 
    1090             :         void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
    1091             :         void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
    1092             :         void (*yield_task) (struct rq *rq);
    1093             : 
    1094             :         void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
    1095             : 
    1096             :         struct task_struct * (*pick_next_task) (struct rq *rq);
    1097             :         void (*put_prev_task) (struct rq *rq, struct task_struct *p);
    1098             : 
    1099             : #ifdef CONFIG_SMP
    1100             :         int  (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
    1101             : 
    1102             :         unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
    1103             :                         struct rq *busiest, unsigned long max_load_move,
    1104             :                         struct sched_domain *sd, enum cpu_idle_type idle,
    1105             :                         int *all_pinned, int *this_best_prio);
    1106             : 
    1107             :         int (*move_one_task) (struct rq *this_rq, int this_cpu,
    1108             :                               struct rq *busiest, struct sched_domain *sd,
    1109             :                               enum cpu_idle_type idle);
    1110             :         void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
    1111             :         void (*post_schedule) (struct rq *this_rq);
    1112             :         void (*task_waking) (struct rq *this_rq, struct task_struct *task);
    1113             :         void (*task_woken) (struct rq *this_rq, struct task_struct *task);
    1114             : 
    1115             :         void (*set_cpus_allowed)(struct task_struct *p,
    1116             :                                  const struct cpumask *newmask);
    1117             : 
    1118             :         void (*rq_online)(struct rq *rq);
    1119             :         void (*rq_offline)(struct rq *rq);
    1120             : #endif
    1121             : 
    1122             :         void (*set_curr_task) (struct rq *rq);
    1123             :         void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
    1124             :         void (*task_fork) (struct task_struct *p);
    1125             : 
    1126             :         void (*switched_from) (struct rq *this_rq, struct task_struct *task,
    1127             :                                int running);
    1128             :         void (*switched_to) (struct rq *this_rq, struct task_struct *task,
    1129             :                              int running);
    1130             :         void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
    1131             :                              int oldprio, int running);
    1132             : 
    1133             :         unsigned int (*get_rr_interval) (struct rq *rq,
    1134             :                                          struct task_struct *task);
    1135           1 : 
    1136             : #ifdef CONFIG_FAIR_GROUP_SCHED
    1137             :         void (*moved_group) (struct task_struct *p, int on_rq);
    1138             : #endif
    1139             : };
    1140             : 
    1141             : struct load_weight {
    1142             :         unsigned long weight, inv_weight;
    1143             : };
    1144           1 : 
    1145             : /*
    1146             :  * CFS stats for a schedulable entity (task, task-group etc)
    1147             :  *
    1148             :  * Current field usage histogram:
    1149             :  *
    1150             :  *     4 se->block_start
    1151             :  *     4 se->run_node
    1152             :  *     4 se->sleep_start
    1153             :  *     6 se->load.weight
    1154             :  */
    1155             : struct sched_entity {
    1156             :         struct load_weight      load;           /* for load-balancing */
    1157             :         struct rb_node          run_node;
    1158             :         struct list_head        group_node;
    1159             :         unsigned int            on_rq;
    1160             : 
    1161             :         u64                     exec_start;
    1162             :         u64                     sum_exec_runtime;
    1163             :         u64                     vruntime;
    1164             :         u64                     prev_sum_exec_runtime;
    1165             : 
    1166             :         u64                     last_wakeup;
    1167             :         u64                     avg_overlap;
    1168             : 
    1169             :         u64                     nr_migrations;
    1170             : 
    1171             :         u64                     start_runtime;
    1172             :         u64                     avg_wakeup;
    1173             : 
    1174           1 : #ifdef CONFIG_SCHEDSTATS
    1175             :         u64                     wait_start;
    1176             :         u64                     wait_max;
    1177             :         u64                     wait_count;
    1178             :         u64                     wait_sum;
    1179             :         u64                     iowait_count;
    1180             :         u64                     iowait_sum;
    1181             : 
    1182             :         u64                     sleep_start;
    1183             :         u64                     sleep_max;
    1184             :         s64                     sum_sleep_runtime;
    1185             : 
    1186             :         u64                     block_start;
    1187             :         u64                     block_max;
    1188             :         u64                     exec_max;
    1189             :         u64                     slice_max;
    1190             : 
    1191             :         u64                     nr_migrations_cold;
    1192             :         u64                     nr_failed_migrations_affine;
    1193             :         u64                     nr_failed_migrations_running;
    1194             :         u64                     nr_failed_migrations_hot;
    1195             :         u64                     nr_forced_migrations;
    1196             : 
    1197             :         u64                     nr_wakeups;
    1198             :         u64                     nr_wakeups_sync;
    1199             :         u64                     nr_wakeups_migrate;
    1200             :         u64                     nr_wakeups_local;
    1201             :         u64                     nr_wakeups_remote;
    1202             :         u64                     nr_wakeups_affine;
    1203             :         u64                     nr_wakeups_affine_attempts;
    1204             :         u64                     nr_wakeups_passive;
    1205             :         u64                     nr_wakeups_idle;
    1206             : #endif
    1207             : 
    1208             : #ifdef CONFIG_FAIR_GROUP_SCHED
    1209             :         struct sched_entity     *parent;
    1210             :         /* rq on which this entity is (to be) queued: */
    1211             :         struct cfs_rq           *cfs_rq;
    1212             :         /* rq "owned" by this entity/group: */
    1213             :         struct cfs_rq           *my_q;
    1214             : #endif
    1215             : };
    1216             : 
    1217             : struct sched_rt_entity {
    1218             :         struct list_head run_list;
    1219             :         unsigned long timeout;
    1220             :         unsigned int time_slice;
    1221             :         int nr_cpus_allowed;
    1222             : 
    1223             :         struct sched_rt_entity *back;
    1224             : #ifdef CONFIG_RT_GROUP_SCHED
    1225             :         struct sched_rt_entity  *parent;
    1226           2 :         /* rq on which this entity is (to be) queued: */
    1227             :         struct rt_rq            *rt_rq;
    1228             :         /* rq "owned" by this entity/group: */
    1229             :         struct rt_rq            *my_q;
    1230             : #endif
    1231             : };
    1232             : 
    1233             : struct rcu_node;
    1234             : 
    1235             : struct task_struct {
    1236             :         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
    1237             :         void *stack;
    1238             :         atomic_t usage;
    1239             :         unsigned int flags;     /* per process flags, defined below */
    1240             :         unsigned int ptrace;
    1241             : 
    1242             :         int lock_depth;         /* BKL lock depth */
    1243             : 
    1244             : #ifdef CONFIG_SMP
    1245             : #ifdef __ARCH_WANT_UNLOCKED_CTXSW
    1246             :         int oncpu;
    1247             : #endif
    1248             : #endif
    1249             : 
    1250             :         int prio, static_prio, normal_prio;
    1251             :         unsigned int rt_priority;
    1252             :         const struct sched_class *sched_class;
    1253             :         struct sched_entity se;
    1254             :         struct sched_rt_entity rt;
    1255             : 
    1256             : #ifdef CONFIG_PREEMPT_NOTIFIERS
    1257             :         /* list of struct preempt_notifier: */
    1258             :         struct hlist_head preempt_notifiers;
    1259             : #endif
    1260             : 
    1261             :         /*
    1262             :          * fpu_counter contains the number of consecutive context switches
    1263             :          * that the FPU is used. If this is over a threshold, the lazy fpu
    1264             :          * saving becomes unlazy to save the trap. This is an unsigned char
    1265             :          * so that after 256 times the counter wraps and the behavior turns
    1266             :          * lazy again; this to deal with bursty apps that only use FPU for
    1267             :          * a short time
    1268             :          */
    1269             :         unsigned char fpu_counter;
    1270             : #ifdef CONFIG_BLK_DEV_IO_TRACE
    1271             :         unsigned int btrace_seq;
    1272             : #endif
    1273             : 
    1274             :         unsigned int policy;
    1275             :         cpumask_t cpus_allowed;
    1276             : 
    1277             : #ifdef CONFIG_TREE_PREEMPT_RCU
    1278             :         int rcu_read_lock_nesting;
    1279             :         char rcu_read_unlock_special;
    1280             :         struct rcu_node *rcu_blocked_node;
    1281             :         struct list_head rcu_node_entry;
    1282             : #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
    1283             : 
    1284             : #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
    1285             :         struct sched_info sched_info;
    1286             : #endif
    1287             : 
    1288             :         struct list_head tasks;
    1289             :         struct plist_node pushable_tasks;
    1290             : 
    1291             :         struct mm_struct *mm, *active_mm;
    1292             : 
    1293             : /* task state */
    1294             :         int exit_state;
    1295             :         int exit_code, exit_signal;
    1296             :         int pdeath_signal;  /*  The signal sent when the parent dies  */
    1297             :         /* ??? */
    1298             :         unsigned int personality;
    1299             :         unsigned did_exec:1;
    1300             :         unsigned in_execve:1;   /* Tell the LSMs that the process is doing an
    1301             :                                  * execve */
    1302             :         unsigned in_iowait:1;
    1303             : 
    1304             : 
    1305             :         /* Revert to default priority/policy when forking */
    1306             :         unsigned sched_reset_on_fork:1;
    1307             : 
    1308             :         pid_t pid;
    1309             :         pid_t tgid;
    1310             : 
    1311             : #ifdef CONFIG_CC_STACKPROTECTOR
    1312             :         /* Canary value for the -fstack-protector gcc feature */
    1313             :         unsigned long stack_canary;
    1314             : #endif
    1315             : 
    1316             :         /* 
    1317             :          * pointers to (original) parent process, youngest child, younger sibling,
    1318             :          * older sibling, respectively.  (p->father can be replaced with 
    1319             :          * p->real_parent->pid)
    1320             :          */
    1321             :         struct task_struct *real_parent; /* real parent process */
    1322             :         struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
    1323             :         /*
    1324             :          * children/sibling forms the list of my natural children
    1325             :          */
    1326             :         struct list_head children;      /* list of my children */
    1327             :         struct list_head sibling;       /* linkage in my parent's children list */
    1328             :         struct task_struct *group_leader;       /* threadgroup leader */
    1329             : 
    1330             :         /*
    1331             :          * ptraced is the list of tasks this task is using ptrace on.
    1332             :          * This includes both natural children and PTRACE_ATTACH targets.
    1333             :          * p->ptrace_entry is p's link on the p->parent->ptraced list.
    1334             :          */
    1335             :         struct list_head ptraced;
    1336             :         struct list_head ptrace_entry;
    1337             : 
    1338             :         /*
    1339             :          * This is the tracer handle for the ptrace BTS extension.
    1340             :          * This field actually belongs to the ptracer task.
    1341             :          */
    1342             :         struct bts_context *bts;
    1343             : 
    1344             :         /* PID/PID hash table linkage. */
    1345             :         struct pid_link pids[PIDTYPE_MAX];
    1346             :         struct list_head thread_group;
    1347             : 
    1348             :         struct completion *vfork_done;          /* for vfork() */
    1349             :         int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
    1350             :         int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
    1351             : 
    1352             :         cputime_t utime, stime, utimescaled, stimescaled;
    1353             :         cputime_t gtime;
    1354             : #ifndef CONFIG_VIRT_CPU_ACCOUNTING
    1355             :         cputime_t prev_utime, prev_stime;
    1356             : #endif
    1357             :         unsigned long nvcsw, nivcsw; /* context switch counts */
    1358             :         struct timespec start_time;             /* monotonic time */
    1359             :         struct timespec real_start_time;        /* boot based time */
    1360             : /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
    1361             :         unsigned long min_flt, maj_flt;
    1362             : 
    1363             :         struct task_cputime cputime_expires;
    1364             :         struct list_head cpu_timers[3];
    1365             : 
    1366             : /* process credentials */
    1367             :         const struct cred *real_cred;   /* objective and real subjective task
    1368             :                                          * credentials (COW) */
    1369             :         const struct cred *cred;        /* effective (overridable) subjective task
    1370             :                                          * credentials (COW) */
    1371             :         struct mutex cred_guard_mutex;  /* guard against foreign influences on
    1372             :                                          * credential calculations
    1373             :                                          * (notably. ptrace) */
    1374             :         struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
    1375             : 
    1376             :         char comm[TASK_COMM_LEN]; /* executable name excluding path
    1377             :                                      - access with [gs]et_task_comm (which lock
    1378             :                                        it with task_lock())
    1379             :                                      - initialized normally by setup_new_exec */
    1380             : /* file system info */
    1381             :         int link_count, total_link_count;
    1382             : #ifdef CONFIG_SYSVIPC
    1383             : /* ipc stuff */
    1384             :         struct sysv_sem sysvsem;
    1385             : #endif
    1386             : #ifdef CONFIG_DETECT_HUNG_TASK
    1387             : /* hung task detection */
    1388             :         unsigned long last_switch_count;
    1389             : #endif
    1390             : /* CPU-specific state of this task */
    1391             :         struct thread_struct thread;
    1392             : /* filesystem information */
    1393             :         struct fs_struct *fs;
    1394             : /* open file information */
    1395             :         struct files_struct *files;
    1396             : /* namespaces */
    1397             :         struct nsproxy *nsproxy;
    1398             : /* signal handlers */
    1399             :         struct signal_struct *signal;
    1400             :         struct sighand_struct *sighand;
    1401             : 
    1402             :         sigset_t blocked, real_blocked;
    1403             :         sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
    1404             :         struct sigpending pending;
    1405             : 
    1406             :         unsigned long sas_ss_sp;
    1407             :         size_t sas_ss_size;
    1408             :         int (*notifier)(void *priv);
    1409             :         void *notifier_data;
    1410             :         sigset_t *notifier_mask;
    1411             :         struct audit_context *audit_context;
    1412             : #ifdef CONFIG_AUDITSYSCALL
    1413             :         uid_t loginuid;
    1414             :         unsigned int sessionid;
    1415             : #endif
    1416             :         seccomp_t seccomp;
    1417             : 
    1418             : /* Thread group tracking */
    1419             :         u32 parent_exec_id;
    1420             :         u32 self_exec_id;
    1421             : /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
    1422             :  * mempolicy */
    1423             :         spinlock_t alloc_lock;
    1424             : 
    1425             : #ifdef CONFIG_GENERIC_HARDIRQS
    1426             :         /* IRQ handler threads */
    1427             :         struct irqaction *irqaction;
    1428             : #endif
    1429             : 
    1430             :         /* Protection of the PI data structures: */
    1431             :         raw_spinlock_t pi_lock;
    1432             : 
    1433             : #ifdef CONFIG_RT_MUTEXES
    1434             :         /* PI waiters blocked on a rt_mutex held by this task */
    1435             :         struct plist_head pi_waiters;
    1436             :         /* Deadlock detection and priority inheritance handling */
    1437             :         struct rt_mutex_waiter *pi_blocked_on;
    1438             : #endif
    1439             : 
    1440             : #ifdef CONFIG_DEBUG_MUTEXES
    1441             :         /* mutex deadlock detection */
    1442             :         struct mutex_waiter *blocked_on;
    1443             : #endif
    1444             : #ifdef CONFIG_TRACE_IRQFLAGS
    1445             :         unsigned int irq_events;
    1446             :         unsigned long hardirq_enable_ip;
    1447             :         unsigned long hardirq_disable_ip;
    1448             :         unsigned int hardirq_enable_event;
    1449             :         unsigned int hardirq_disable_event;
    1450             :         int hardirqs_enabled;
    1451             :         int hardirq_context;
    1452             :         unsigned long softirq_disable_ip;
    1453             :         unsigned long softirq_enable_ip;
    1454             :         unsigned int softirq_disable_event;
    1455             :         unsigned int softirq_enable_event;
    1456             :         int softirqs_enabled;
    1457             :         int softirq_context;
    1458             : #endif
    1459             : #ifdef CONFIG_LOCKDEP
    1460             : # define MAX_LOCK_DEPTH 48UL
    1461             :         u64 curr_chain_key;
    1462             :         int lockdep_depth;
    1463             :         unsigned int lockdep_recursion;
    1464             :         struct held_lock held_locks[MAX_LOCK_DEPTH];
    1465             :         gfp_t lockdep_reclaim_gfp;
    1466             : #endif
    1467             : 
    1468             : /* journalling filesystem info */
    1469             :         void *journal_info;
    1470             : 
    1471             : /* stacked block device info */
    1472             :         struct bio *bio_list, **bio_tail;
    1473             : 
    1474             : /* VM state */
    1475             :         struct reclaim_state *reclaim_state;
    1476             : 
    1477             :         struct backing_dev_info *backing_dev_info;
    1478             : 
    1479             :         struct io_context *io_context;
    1480             : 
    1481             :         unsigned long ptrace_message;
    1482             :         siginfo_t *last_siginfo; /* For ptrace use.  */
    1483             :         struct task_io_accounting ioac;
    1484             : #if defined(CONFIG_TASK_XACCT)
    1485             :         u64 acct_rss_mem1;      /* accumulated rss usage */
    1486             :         u64 acct_vm_mem1;       /* accumulated virtual memory usage */
    1487             :         cputime_t acct_timexpd; /* stime + utime since last update */
    1488             : #endif
    1489             : #ifdef CONFIG_CPUSETS
    1490             :         nodemask_t mems_allowed;        /* Protected by alloc_lock */
    1491             :         int cpuset_mem_spread_rotor;
    1492             : #endif
    1493             : #ifdef CONFIG_CGROUPS
    1494             :         /* Control Group info protected by css_set_lock */
    1495             :         struct css_set *cgroups;
    1496             :         /* cg_list protected by css_set_lock and tsk->alloc_lock */
    1497             :         struct list_head cg_list;
    1498             : #endif
    1499             : #ifdef CONFIG_FUTEX
    1500             :         struct robust_list_head __user *robust_list;
    1501             : #ifdef CONFIG_COMPAT
    1502             :         struct compat_robust_list_head __user *compat_robust_list;
    1503             : #endif
    1504             :         struct list_head pi_state_list;
    1505             :         struct futex_pi_state *pi_state_cache;
    1506             : #endif
    1507             : #ifdef CONFIG_PERF_EVENTS
    1508             :         struct perf_event_context *perf_event_ctxp;
    1509             :         struct mutex perf_event_mutex;
    1510             :         struct list_head perf_event_list;
    1511             : #endif
    1512             : #ifdef CONFIG_NUMA
    1513             :         struct mempolicy *mempolicy;    /* Protected by alloc_lock */
    1514             :         short il_next;
    1515             : #endif
    1516             :         atomic_t fs_excl;       /* holding fs exclusive resources */
    1517             :         struct rcu_head rcu;
    1518             : 
    1519             :         /*
    1520             :          * cache last used pipe for splice
    1521             :          */
    1522             :         struct pipe_inode_info *splice_pipe;
    1523             : #ifdef  CONFIG_TASK_DELAY_ACCT
    1524             :         struct task_delay_info *delays;
    1525             : #endif
    1526             : #ifdef CONFIG_FAULT_INJECTION
    1527             :         int make_it_fail;
    1528             : #endif
    1529             :         struct prop_local_single dirties;
    1530             : #ifdef CONFIG_LATENCYTOP
    1531             :         int latency_record_count;
    1532             :         struct latency_record latency_record[LT_SAVECOUNT];
    1533             : #endif
    1534             :         /*
    1535             :          * time slack values; these are used to round up poll() and
    1536             :          * select() etc timeout values. These are in nanoseconds.
    1537             :          */
    1538             :         unsigned long timer_slack_ns;
    1539             :         unsigned long default_timer_slack_ns;
    1540             : 
    1541             :         struct list_head        *scm_work_list;
    1542             : #ifdef CONFIG_FUNCTION_GRAPH_TRACER
    1543             :         /* Index of current stored adress in ret_stack */
    1544             :         int curr_ret_stack;
    1545             :         /* Stack of return addresses for return function tracing */
    1546             :         struct ftrace_ret_stack *ret_stack;
    1547             :         /* time stamp for last schedule */
    1548             :         unsigned long long ftrace_timestamp;
    1549             :         /*
    1550             :          * Number of functions that haven't been traced
    1551             :          * because of depth overrun.
    1552             :          */
    1553             :         atomic_t trace_overrun;
    1554             :         /* Pause for the tracing */
    1555             :         atomic_t tracing_graph_pause;
    1556             : #endif
    1557             : #ifdef CONFIG_TRACING
    1558             :         /* state flags for use by tracers */
    1559             :         unsigned long trace;
    1560             :         /* bitmask of trace recursion */
    1561             :         unsigned long trace_recursion;
    1562             : #endif /* CONFIG_TRACING */
    1563             : #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
    1564             :         struct memcg_batch_info {
    1565             :                 int do_batch;   /* incremented when batch uncharge started */
    1566             :                 struct mem_cgroup *memcg; /* target memcg of uncharge */
    1567             :                 unsigned long bytes;            /* uncharged usage */
    1568             :                 unsigned long memsw_bytes; /* uncharged mem+swap usage */
    1569             :         } memcg_batch;
    1570             : #endif
    1571             : #ifdef CONFIG_HAVE_HW_BREAKPOINT
    1572             :         atomic_t ptrace_bp_refcnt;
    1573             : #endif
    1574             : };
    1575             : 
    1576             : /* Future-safe accessor for struct task_struct's cpus_allowed. */
    1577             : #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
    1578             : 
    1579             : /*
    1580             :  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
    1581             :  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
    1582             :  * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
    1583             :  * values are inverted: lower p->prio value means higher priority.
    1584             :  *
    1585             :  * The MAX_USER_RT_PRIO value allows the actual maximum
    1586             :  * RT priority to be separate from the value exported to
    1587             :  * user-space.  This allows kernel threads to set their
    1588             :  * priority to a value higher than any user task. Note:
    1589             :  * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
    1590             :  */
    1591             : 
    1592             : #define MAX_USER_RT_PRIO        100
    1593             : #define MAX_RT_PRIO             MAX_USER_RT_PRIO
    1594             : 
    1595             : #define MAX_PRIO                (MAX_RT_PRIO + 40)
    1596             : #define DEFAULT_PRIO            (MAX_RT_PRIO + 20)
    1597             : 
    1598             : static inline int rt_prio(int prio)
    1599             : {
    1600             :         if (unlikely(prio < MAX_RT_PRIO))
    1601             :                 return 1;
    1602             :         return 0;
    1603             : }
    1604             : 
    1605             : static inline int rt_task(struct task_struct *p)
    1606             : {
    1607             :         return rt_prio(p->prio);
    1608             : }
    1609             : 
    1610             : static inline struct pid *task_pid(struct task_struct *task)
    1611             : {
    1612             :         return task->pids[PIDTYPE_PID].pid;
    1613             : }
    1614             : 
    1615             : static inline struct pid *task_tgid(struct task_struct *task)
    1616             : {
    1617             :         return task->group_leader->pids[PIDTYPE_PID].pid;
    1618             : }
    1619             : 
    1620             : /*
    1621             :  * Without tasklist or rcu lock it is not safe to dereference
    1622             :  * the result of task_pgrp/task_session even if task == current,
    1623             :  * we can race with another thread doing sys_setsid/sys_setpgid.
    1624             :  */
    1625             : static inline struct pid *task_pgrp(struct task_struct *task)
    1626             : {
    1627             :         return task->group_leader->pids[PIDTYPE_PGID].pid;
    1628             : }
    1629             : 
    1630             : static inline struct pid *task_session(struct task_struct *task)
    1631             : {
    1632             :         return task->group_leader->pids[PIDTYPE_SID].pid;
    1633             : }
    1634             : 
    1635             : struct pid_namespace;
    1636             : 
    1637             : /*
    1638             :  * the helpers to get the task's different pids as they are seen
    1639             :  * from various namespaces
    1640             :  *
    1641             :  * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
    1642             :  * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
    1643             :  *                     current.
    1644             :  * task_xid_nr_ns()  : id seen from the ns specified;
    1645             :  *
    1646             :  * set_task_vxid()   : assigns a virtual id to a task;
    1647             :  *
    1648             :  * see also pid_nr() etc in include/linux/pid.h
    1649             :  */
    1650             : pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
    1651             :                         struct pid_namespace *ns);
    1652             : 
    1653             : static inline pid_t task_pid_nr(struct task_struct *tsk)
    1654             : {
    1655             :         return tsk->pid;
    1656             : }
    1657             : 
    1658             : static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
    1659             :                                         struct pid_namespace *ns)
    1660             : {
    1661             :         return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
    1662             : }
    1663             : 
    1664             : static inline pid_t task_pid_vnr(struct task_struct *tsk)
    1665             : {
    1666             :         return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
    1667             : }
    1668             : 
    1669             : 
    1670             : static inline pid_t task_tgid_nr(struct task_struct *tsk)
    1671             : {
    1672             :         return tsk->tgid;
    1673             : }
    1674             : 
    1675             : pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
    1676             : 
    1677             : static inline pid_t task_tgid_vnr(struct task_struct *tsk)
    1678             : {
    1679             :         return pid_vnr(task_tgid(tsk));
    1680             : }
    1681             : 
    1682             : 
    1683             : static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
    1684             :                                         struct pid_namespace *ns)
    1685             : {
    1686             :         return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
    1687             : }
    1688             : 
    1689             : static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
    1690             : {
    1691             :         return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
    1692             : }
    1693             : 
    1694             : 
    1695             : static inline pid_t task_session_nr_ns(struct task_struct *tsk,
    1696             :                                         struct pid_namespace *ns)
    1697             : {
    1698             :         return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
    1699             : }
    1700             : 
    1701             : static inline pid_t task_session_vnr(struct task_struct *tsk)
    1702             : {
    1703             :         return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
    1704             : }
    1705             : 
    1706             : /* obsolete, do not use */
    1707             : static inline pid_t task_pgrp_nr(struct task_struct *tsk)
    1708             : {
    1709             :         return task_pgrp_nr_ns(tsk, &init_pid_ns);
    1710             : }
    1711             : 
    1712             : /**
    1713             :  * pid_alive - check that a task structure is not stale
    1714             :  * @p: Task structure to be checked.
    1715             :  *
    1716             :  * Test if a process is not yet dead (at most zombie state)
    1717             :  * If pid_alive fails, then pointers within the task structure
    1718             :  * can be stale and must not be dereferenced.
    1719             :  */
    1720             : static inline int pid_alive(struct task_struct *p)
    1721             : {
    1722             :         return p->pids[PIDTYPE_PID].pid != NULL;
    1723             : }
    1724             : 
    1725             : /**
    1726             :  * is_global_init - check if a task structure is init
    1727             :  * @tsk: Task structure to be checked.
    1728             :  *
    1729             :  * Check if a task structure is the first user space task the kernel created.
    1730             :  */
    1731             : static inline int is_global_init(struct task_struct *tsk)
    1732             : {
    1733             :         return tsk->pid == 1;
    1734             : }
    1735             : 
    1736             : /*
    1737             :  * is_container_init:
    1738             :  * check whether in the task is init in its own pid namespace.
    1739             :  */
    1740             : extern int is_container_init(struct task_struct *tsk);
    1741             : 
    1742             : extern struct pid *cad_pid;
    1743             : 
    1744             : extern void free_task(struct task_struct *tsk);
    1745             : #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
    1746             : 
    1747             : extern void __put_task_struct(struct task_struct *t);
    1748             : 
    1749             : static inline void put_task_struct(struct task_struct *t)
    1750             : {
    1751             :         if (atomic_dec_and_test(&t->usage))
    1752             :                 __put_task_struct(t);
    1753             : }
    1754             : 
    1755             : extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
    1756             : extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
    1757             : 
    1758             : /*
    1759             :  * Per process flags
    1760             :  */
    1761             : #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
    1762             :                                         /* Not implemented yet, only for 486*/
    1763             : #define PF_STARTING     0x00000002      /* being created */
    1764             : #define PF_EXITING      0x00000004      /* getting shut down */
    1765             : #define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
    1766             : #define PF_VCPU         0x00000010      /* I'm a virtual CPU */
    1767             : #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
    1768             : #define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
    1769             : #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
    1770             : #define PF_DUMPCORE     0x00000200      /* dumped core */
    1771             : #define PF_SIGNALED     0x00000400      /* killed by a signal */
    1772             : #define PF_MEMALLOC     0x00000800      /* Allocating memory */
    1773             : #define PF_FLUSHER      0x00001000      /* responsible for disk writeback */
    1774             : #define PF_USED_MATH    0x00002000      /* if unset the fpu must be initialized before use */
    1775             : #define PF_FREEZING     0x00004000      /* freeze in progress. do not account to load */
    1776             : #define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
    1777             : #define PF_FROZEN       0x00010000      /* frozen for system suspend */
    1778             : #define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
    1779             : #define PF_KSWAPD       0x00040000      /* I am kswapd */
    1780             : #define PF_OOM_ORIGIN   0x00080000      /* Allocating much memory to others */
    1781             : #define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
    1782             : #define PF_KTHREAD      0x00200000      /* I am a kernel thread */
    1783             : #define PF_RANDOMIZE    0x00400000      /* randomize virtual address space */
    1784             : #define PF_SWAPWRITE    0x00800000      /* Allowed to write to swap */
    1785             : #define PF_SPREAD_PAGE  0x01000000      /* Spread page cache over cpuset */
    1786             : #define PF_SPREAD_SLAB  0x02000000      /* Spread some slab caches over cpuset */
    1787             : #define PF_THREAD_BOUND 0x04000000      /* Thread bound to specific cpu */
    1788             : #define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
    1789             : #define PF_MEMPOLICY    0x10000000      /* Non-default NUMA mempolicy */
    1790             : #define PF_MUTEX_TESTER 0x20000000      /* Thread belongs to the rt mutex tester */
    1791             : #define PF_FREEZER_SKIP 0x40000000      /* Freezer should not count it as freezeable */
    1792             : #define PF_FREEZER_NOSIG 0x80000000     /* Freezer won't send signals to it */
    1793             : 
    1794             : /*
    1795             :  * Only the _current_ task can read/write to tsk->flags, but other
    1796             :  * tasks can access tsk->flags in readonly mode for example
    1797             :  * with tsk_used_math (like during threaded core dumping).
    1798             :  * There is however an exception to this rule during ptrace
    1799             :  * or during fork: the ptracer task is allowed to write to the
    1800             :  * child->flags of its traced child (same goes for fork, the parent
    1801             :  * can write to the child->flags), because we're guaranteed the
    1802             :  * child is not running and in turn not changing child->flags
    1803             :  * at the same time the parent does it.
    1804             :  */
    1805             : #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
    1806             : #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
    1807             : #define clear_used_math() clear_stopped_child_used_math(current)
    1808             : #define set_used_math() set_stopped_child_used_math(current)
    1809             : #define conditional_stopped_child_used_math(condition, child) \
    1810             :         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
    1811             : #define conditional_used_math(condition) \
    1812             :         conditional_stopped_child_used_math(condition, current)
    1813             : #define copy_to_stopped_child_used_math(child) \
    1814             :         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
    1815             : /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
    1816             : #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
    1817             : #define used_math() tsk_used_math(current)
    1818             : 
    1819             : #ifdef CONFIG_TREE_PREEMPT_RCU
    1820             : 
    1821             : #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
    1822             : #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
    1823             : 
    1824             : static inline void rcu_copy_process(struct task_struct *p)
    1825             : {
    1826             :         p->rcu_read_lock_nesting = 0;
    1827             :         p->rcu_read_unlock_special = 0;
    1828             :         p->rcu_blocked_node = NULL;
    1829             :         INIT_LIST_HEAD(&p->rcu_node_entry);
    1830             : }
    1831             : 
    1832             : #else
    1833             : 
    1834             : static inline void rcu_copy_process(struct task_struct *p)
    1835             : {
    1836             : }
    1837             : 
    1838             : #endif
    1839             : 
    1840             : #ifdef CONFIG_SMP
    1841             : extern int set_cpus_allowed_ptr(struct task_struct *p,
    1842             :                                 const struct cpumask *new_mask);
    1843             : #else
    1844             : static inline int set_cpus_allowed_ptr(struct task_struct *p,
    1845             :                                        const struct cpumask *new_mask)
    1846             : {
    1847             :         if (!cpumask_test_cpu(0, new_mask))
    1848             :                 return -EINVAL;
    1849             :         return 0;
    1850             : }
    1851             : #endif
    1852             : 
    1853             : #ifndef CONFIG_CPUMASK_OFFSTACK
    1854             : static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
    1855             : {
    1856             :         return set_cpus_allowed_ptr(p, &new_mask);
    1857             : }
    1858             : #endif
    1859             : 
    1860             : /*
    1861             :  * Architectures can set this to 1 if they have specified
    1862             :  * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
    1863             :  * but then during bootup it turns out that sched_clock()
    1864             :  * is reliable after all:
    1865             :  */
    1866             : #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
    1867             : extern int sched_clock_stable;
    1868             : #endif
    1869             : 
    1870             : /* ftrace calls sched_clock() directly */
    1871             : extern unsigned long long notrace sched_clock(void);
    1872             : 
    1873             : extern void sched_clock_init(void);
    1874             : extern u64 sched_clock_cpu(int cpu);
    1875             : 
    1876             : #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
    1877             : static inline void sched_clock_tick(void)
    1878             : {
    1879             : }
    1880             : 
    1881             : static inline void sched_clock_idle_sleep_event(void)
    1882             : {
    1883             : }
    1884             : 
    1885             : static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
    1886             : {
    1887             : }
    1888             : #else
    1889             : extern void sched_clock_tick(void);
    1890             : extern void sched_clock_idle_sleep_event(void);
    1891             : extern void sched_clock_idle_wakeup_event(u64 delta_ns);
    1892             : #endif
    1893             : 
    1894             : /*
    1895             :  * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
    1896             :  * clock constructed from sched_clock():
    1897             :  */
    1898             : extern unsigned long long cpu_clock(int cpu);
    1899             : 
    1900             : extern unsigned long long
    1901             : task_sched_runtime(struct task_struct *task);
    1902             : extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
    1903             : 
    1904             : /* sched_exec is called by processes performing an exec */
    1905             : #ifdef CONFIG_SMP
    1906             : extern void sched_exec(void);
    1907             : #else
    1908             : #define sched_exec()   {}
    1909             : #endif
    1910             : 
    1911             : extern void sched_clock_idle_sleep_event(void);
    1912             : extern void sched_clock_idle_wakeup_event(u64 delta_ns);
    1913             : 
    1914             : #ifdef CONFIG_HOTPLUG_CPU
    1915             : extern void idle_task_exit(void);
    1916             : #else
    1917             : static inline void idle_task_exit(void) {}
    1918             : #endif
    1919             : 
    1920             : extern void sched_idle_next(void);
    1921             : 
    1922             : #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
    1923             : extern void wake_up_idle_cpu(int cpu);
    1924             : #else
    1925             : static inline void wake_up_idle_cpu(int cpu) { }
    1926             : #endif
    1927             : 
    1928             : extern unsigned int sysctl_sched_latency;
    1929             : extern unsigned int sysctl_sched_min_granularity;
    1930             : extern unsigned int sysctl_sched_wakeup_granularity;
    1931             : extern unsigned int sysctl_sched_shares_ratelimit;
    1932             : extern unsigned int sysctl_sched_shares_thresh;
    1933             : extern unsigned int sysctl_sched_child_runs_first;
    1934             : 
    1935             : enum sched_tunable_scaling {
    1936             :         SCHED_TUNABLESCALING_NONE,
    1937             :         SCHED_TUNABLESCALING_LOG,
    1938             :         SCHED_TUNABLESCALING_LINEAR,
    1939             :         SCHED_TUNABLESCALING_END,
    1940             : };
    1941             : extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
    1942             : 
    1943             : #ifdef CONFIG_SCHED_DEBUG
    1944             : extern unsigned int sysctl_sched_migration_cost;
    1945             : extern unsigned int sysctl_sched_nr_migrate;
    1946             : extern unsigned int sysctl_sched_time_avg;
    1947             : extern unsigned int sysctl_timer_migration;
    1948             : 
    1949             : int sched_proc_update_handler(struct ctl_table *table, int write,
    1950             :                 void __user *buffer, size_t *length,
    1951             :                 loff_t *ppos);
    1952             : #endif
    1953             : #ifdef CONFIG_SCHED_DEBUG
    1954             : static inline unsigned int get_sysctl_timer_migration(void)
    1955             : {
    1956             :         return sysctl_timer_migration;
    1957             : }
    1958             : #else
    1959             : static inline unsigned int get_sysctl_timer_migration(void)
    1960             : {
    1961             :         return 1;
    1962             : }
    1963             : #endif
    1964             : extern unsigned int sysctl_sched_rt_period;
    1965             : extern int sysctl_sched_rt_runtime;
    1966             : 
    1967             : int sched_rt_handler(struct ctl_table *table, int write,
    1968             :                 void __user *buffer, size_t *lenp,
    1969             :                 loff_t *ppos);
    1970             : 
    1971             : extern unsigned int sysctl_sched_compat_yield;
    1972             : 
    1973             : #ifdef CONFIG_RT_MUTEXES
    1974             : extern int rt_mutex_getprio(struct task_struct *p);
    1975             : extern void rt_mutex_setprio(struct task_struct *p, int prio);
    1976             : extern void rt_mutex_adjust_pi(struct task_struct *p);
    1977             : #else
    1978             : static inline int rt_mutex_getprio(struct task_struct *p)
    1979             : {
    1980             :         return p->normal_prio;
    1981             : }
    1982             : # define rt_mutex_adjust_pi(p)          do { } while (0)
    1983             : #endif
    1984             : 
    1985             : extern void set_user_nice(struct task_struct *p, long nice);
    1986             : extern int task_prio(const struct task_struct *p);
    1987             : extern int task_nice(const struct task_struct *p);
    1988             : extern int can_nice(const struct task_struct *p, const int nice);
    1989             : extern int task_curr(const struct task_struct *p);
    1990             : extern int idle_cpu(int cpu);
    1991             : extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
    1992             : extern int sched_setscheduler_nocheck(struct task_struct *, int,
    1993             :                                       struct sched_param *);
    1994             : extern struct task_struct *idle_task(int cpu);
    1995             : extern struct task_struct *curr_task(int cpu);
    1996             : extern void set_curr_task(int cpu, struct task_struct *p);
    1997             : 
    1998             : void yield(void);
    1999             : 
    2000             : /*
    2001             :  * The default (Linux) execution domain.
    2002             :  */
    2003             : extern struct exec_domain       default_exec_domain;
    2004             : 
    2005             : union thread_union {
    2006             :         struct thread_info thread_info;
    2007             :         unsigned long stack[THREAD_SIZE/sizeof(long)];
    2008             : };
    2009             : 
    2010             : #ifndef __HAVE_ARCH_KSTACK_END
    2011             : static inline int kstack_end(void *addr)
    2012             : {
    2013             :         /* Reliable end of stack detection:
    2014             :          * Some APM bios versions misalign the stack
    2015             :          */
    2016             :         return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
    2017             : }
    2018             : #endif
    2019             : 
    2020             : extern union thread_union init_thread_union;
    2021             : extern struct task_struct init_task;
    2022             : 
    2023             : extern struct   mm_struct init_mm;
    2024             : 
    2025             : extern struct pid_namespace init_pid_ns;
    2026             : 
    2027             : /*
    2028             :  * find a task by one of its numerical ids
    2029             :  *
    2030             :  * find_task_by_pid_ns():
    2031             :  *      finds a task by its pid in the specified namespace
    2032             :  * find_task_by_vpid():
    2033             :  *      finds a task by its virtual pid
    2034             :  *
    2035             :  * see also find_vpid() etc in include/linux/pid.h
    2036             :  */
    2037             : 
    2038             : extern struct task_struct *find_task_by_vpid(pid_t nr);
    2039             : extern struct task_struct *find_task_by_pid_ns(pid_t nr,
    2040             :                 struct pid_namespace *ns);
    2041             : 
    2042             : extern void __set_special_pids(struct pid *pid);
    2043             : 
    2044             : /* per-UID process charging. */
    2045             : extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
    2046             : static inline struct user_struct *get_uid(struct user_struct *u)
    2047             : {
    2048             :         atomic_inc(&u->__count);
    2049             :         return u;
    2050             : }
    2051             : extern void free_uid(struct user_struct *);
    2052             : extern void release_uids(struct user_namespace *ns);
    2053             : 
    2054             : #include <asm/current.h>
    2055             : 
    2056             : extern void do_timer(unsigned long ticks);
    2057             : 
    2058             : extern int wake_up_state(struct task_struct *tsk, unsigned int state);
    2059             : extern int wake_up_process(struct task_struct *tsk);
    2060             : extern void wake_up_new_task(struct task_struct *tsk,
    2061             :                                 unsigned long clone_flags);
    2062             : #ifdef CONFIG_SMP
    2063             :  extern void kick_process(struct task_struct *tsk);
    2064             : #else
    2065             :  static inline void kick_process(struct task_struct *tsk) { }
    2066             : #endif
    2067             : extern void sched_fork(struct task_struct *p, int clone_flags);
    2068             : extern void sched_dead(struct task_struct *p);
    2069             : 
    2070             : extern void proc_caches_init(void);
    2071             : extern void flush_signals(struct task_struct *);
    2072             : extern void __flush_signals(struct task_struct *);
    2073             : extern void ignore_signals(struct task_struct *);
    2074             : extern void flush_signal_handlers(struct task_struct *, int force_default);
    2075             : extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
    2076             : 
    2077             : static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
    2078             : {
    2079             :         unsigned long flags;
    2080             :         int ret;
    2081             : 
    2082             :         spin_lock_irqsave(&tsk->sighand->siglock, flags);
    2083             :         ret = dequeue_signal(tsk, mask, info);
    2084             :         spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
    2085             : 
    2086             :         return ret;
    2087             : }       
    2088             : 
    2089             : extern void block_all_signals(int (*notifier)(void *priv), void *priv,
    2090             :                               sigset_t *mask);
    2091             : extern void unblock_all_signals(void);
    2092             : extern void release_task(struct task_struct * p);
    2093             : extern int send_sig_info(int, struct siginfo *, struct task_struct *);
    2094             : extern int force_sigsegv(int, struct task_struct *);
    2095             : extern int force_sig_info(int, struct siginfo *, struct task_struct *);
    2096             : extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
    2097             : extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
    2098             : extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
    2099             : extern int kill_pgrp(struct pid *pid, int sig, int priv);
    2100             : extern int kill_pid(struct pid *pid, int sig, int priv);
    2101             : extern int kill_proc_info(int, struct siginfo *, pid_t);
    2102             : extern int do_notify_parent(struct task_struct *, int);
    2103             : extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
    2104             : extern void force_sig(int, struct task_struct *);
    2105             : extern int send_sig(int, struct task_struct *, int);
    2106             : extern void zap_other_threads(struct task_struct *p);
    2107             : extern struct sigqueue *sigqueue_alloc(void);
    2108             : extern void sigqueue_free(struct sigqueue *);
    2109             : extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
    2110             : extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
    2111             : extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
    2112             : 
    2113             : static inline int kill_cad_pid(int sig, int priv)
    2114             : {
    2115             :         return kill_pid(cad_pid, sig, priv);
    2116             : }
    2117             : 
    2118             : /* These can be the second arg to send_sig_info/send_group_sig_info.  */
    2119             : #define SEND_SIG_NOINFO ((struct siginfo *) 0)
    2120             : #define SEND_SIG_PRIV   ((struct siginfo *) 1)
    2121             : #define SEND_SIG_FORCED ((struct siginfo *) 2)
    2122             : 
    2123             : /*
    2124             :  * True if we are on the alternate signal stack.
    2125             :  */
    2126             : static inline int on_sig_stack(unsigned long sp)
    2127             : {
    2128             : #ifdef CONFIG_STACK_GROWSUP
    2129             :         return sp >= current->sas_ss_sp &&
    2130             :                 sp - current->sas_ss_sp < current->sas_ss_size;
    2131             : #else
    2132             :         return sp > current->sas_ss_sp &&
    2133             :                 sp - current->sas_ss_sp <= current->sas_ss_size;
    2134             : #endif
    2135             : }
    2136             : 
    2137             : static inline int sas_ss_flags(unsigned long sp)
    2138             : {
    2139             :         return (current->sas_ss_size == 0 ? SS_DISABLE
    2140             :                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
    2141             : }
    2142             : 
    2143             : /*
    2144             :  * Routines for handling mm_structs
    2145             :  */
    2146             : extern struct mm_struct * mm_alloc(void);
    2147             : 
    2148             : /* mmdrop drops the mm and the page tables */
    2149             : extern void __mmdrop(struct mm_struct *);
    2150             : static inline void mmdrop(struct mm_struct * mm)
    2151             : {
    2152             :         if (unlikely(atomic_dec_and_test(&mm->mm_count)))
    2153             :                 __mmdrop(mm);
    2154             : }
    2155             : 
    2156             : /* mmput gets rid of the mappings and all user-space */
    2157             : extern void mmput(struct mm_struct *);
    2158             : /* Grab a reference to a task's mm, if it is not already going away */
    2159             : extern struct mm_struct *get_task_mm(struct task_struct *task);
    2160             : /* Remove the current tasks stale references to the old mm_struct */
    2161             : extern void mm_release(struct task_struct *, struct mm_struct *);
    2162             : /* Allocate a new mm structure and copy contents from tsk->mm */
    2163             : extern struct mm_struct *dup_mm(struct task_struct *tsk);
    2164             : 
    2165             : extern int copy_thread(unsigned long, unsigned long, unsigned long,
    2166             :                         struct task_struct *, struct pt_regs *);
    2167             : extern void flush_thread(void);
    2168             : extern void exit_thread(void);
    2169             : 
    2170             : extern void exit_files(struct task_struct *);
    2171             : extern void __cleanup_signal(struct signal_struct *);
    2172             : extern void __cleanup_sighand(struct sighand_struct *);
    2173             : 
    2174             : extern void exit_itimers(struct signal_struct *);
    2175             : extern void flush_itimer_signals(void);
    2176             : 
    2177             : extern NORET_TYPE void do_group_exit(int);
    2178             : 
    2179             : extern void daemonize(const char *, ...);
    2180             : extern int allow_signal(int);
    2181             : extern int disallow_signal(int);
    2182             : 
    2183             : extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
    2184             : extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
    2185             : struct task_struct *fork_idle(int);
    2186             : 
    2187             : extern void set_task_comm(struct task_struct *tsk, char *from);
    2188             : extern char *get_task_comm(char *to, struct task_struct *tsk);
    2189             : 
    2190             : #ifdef CONFIG_SMP
    2191             : extern void wait_task_context_switch(struct task_struct *p);
    2192             : extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
    2193             : #else
    2194             : static inline void wait_task_context_switch(struct task_struct *p) {}
    2195             : static inline unsigned long wait_task_inactive(struct task_struct *p,
    2196             :                                                long match_state)
    2197             : {
    2198             :         return 1;
    2199             : }
    2200             : #endif
    2201             : 
    2202             : #define next_task(p) \
    2203             :         list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
    2204             : 
    2205             : #define for_each_process(p) \
    2206             :         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
    2207             : 
    2208             : extern bool current_is_single_threaded(void);
    2209             : 
    2210             : /*
    2211             :  * Careful: do_each_thread/while_each_thread is a double loop so
    2212             :  *          'break' will not work as expected - use goto instead.
    2213             :  */
    2214             : #define do_each_thread(g, t) \
    2215             :         for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
    2216             : 
    2217             : #define while_each_thread(g, t) \
    2218             :         while ((t = next_thread(t)) != g)
    2219             : 
    2220             : /* de_thread depends on thread_group_leader not being a pid based check */
    2221             : #define thread_group_leader(p)  (p == p->group_leader)
    2222             : 
    2223             : /* Do to the insanities of de_thread it is possible for a process
    2224             :  * to have the pid of the thread group leader without actually being
    2225             :  * the thread group leader.  For iteration through the pids in proc
    2226             :  * all we care about is that we have a task with the appropriate
    2227             :  * pid, we don't actually care if we have the right task.
    2228             :  */
    2229             : static inline int has_group_leader_pid(struct task_struct *p)
    2230             : {
    2231             :         return p->pid == p->tgid;
    2232             : }
    2233             : 
    2234             : static inline
    2235             : int same_thread_group(struct task_struct *p1, struct task_struct *p2)
    2236             : {
    2237             :         return p1->tgid == p2->tgid;
    2238             : }
    2239             : 
    2240             : static inline struct task_struct *next_thread(const struct task_struct *p)
    2241             : {
    2242             :         return list_entry_rcu(p->thread_group.next,
    2243             :                               struct task_struct, thread_group);
    2244             : }
    2245             : 
    2246             : static inline int thread_group_empty(struct task_struct *p)
    2247             : {
    2248             :         return list_empty(&p->thread_group);
    2249             : }
    2250             : 
    2251             : #define delay_group_leader(p) \
    2252             :                 (thread_group_leader(p) && !thread_group_empty(p))
    2253             : 
    2254             : static inline int task_detached(struct task_struct *p)
    2255             : {
    2256             :         return p->exit_signal == -1;
    2257             : }
    2258             : 
    2259             : /*
    2260             :  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
    2261             :  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
    2262             :  * pins the final release of task.io_context.  Also protects ->cpuset and
    2263             :  * ->cgroup.subsys[].
    2264             :  *
    2265             :  * Nests both inside and outside of read_lock(&tasklist_lock).
    2266             :  * It must not be nested with write_lock_irq(&tasklist_lock),
    2267             :  * neither inside nor outside.
    2268             :  */
    2269             : static inline void task_lock(struct task_struct *p)
    2270             : {
    2271             :         spin_lock(&p->alloc_lock);
    2272             : }
    2273             : 
    2274             : static inline void task_unlock(struct task_struct *p)
    2275             : {
    2276             :         spin_unlock(&p->alloc_lock);
    2277             : }
    2278             : 
    2279             : extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
    2280             :                                                         unsigned long *flags);
    2281             : 
    2282             : static inline void unlock_task_sighand(struct task_struct *tsk,
    2283             :                                                 unsigned long *flags)
    2284             : {
    2285             :         spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
    2286             : }
    2287             : 
    2288             : #ifndef __HAVE_THREAD_FUNCTIONS
    2289             : 
    2290             : #define task_thread_info(task)  ((struct thread_info *)(task)->stack)
    2291             : #define task_stack_page(task)   ((task)->stack)
    2292             : 
    2293             : static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
    2294             : {
    2295             :         *task_thread_info(p) = *task_thread_info(org);
    2296             :         task_thread_info(p)->task = p;
    2297             : }
    2298             : 
    2299             : static inline unsigned long *end_of_stack(struct task_struct *p)
    2300             : {
    2301             :         return (unsigned long *)(task_thread_info(p) + 1);
    2302             : }
    2303             : 
    2304             : #endif
    2305             : 
    2306             : static inline int object_is_on_stack(void *obj)
    2307             : {
    2308             :         void *stack = task_stack_page(current);
    2309             : 
    2310             :         return (obj >= stack) && (obj < (stack + THREAD_SIZE));
    2311             : }
    2312             : 
    2313             : extern void thread_info_cache_init(void);
    2314             : 
    2315             : #ifdef CONFIG_DEBUG_STACK_USAGE
    2316             : static inline unsigned long stack_not_used(struct task_struct *p)
    2317             : {
    2318             :         unsigned long *n = end_of_stack(p);
    2319             : 
    2320             :         do {    /* Skip over canary */
    2321             :                 n++;
    2322             :         } while (!*n);
    2323             : 
    2324             :         return (unsigned long)n - (unsigned long)end_of_stack(p);
    2325             : }
    2326             : #endif
    2327             : 
    2328             : /* set thread flags in other task's structures
    2329             :  * - see asm/thread_info.h for TIF_xxxx flags available
    2330             :  */
    2331             : static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
    2332             : {
    2333             :         set_ti_thread_flag(task_thread_info(tsk), flag);
    2334             : }
    2335             : 
    2336             : static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
    2337             : {
    2338             :         clear_ti_thread_flag(task_thread_info(tsk), flag);
    2339             : }
    2340             : 
    2341             : static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
    2342             : {
    2343             :         return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
    2344             : }
    2345             : 
    2346             : static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
    2347             : {
    2348             :         return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
    2349             : }
    2350             : 
    2351             : static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
    2352             : {
    2353             :         return test_ti_thread_flag(task_thread_info(tsk), flag);
    2354             : }
    2355             : 
    2356             : static inline void set_tsk_need_resched(struct task_struct *tsk)
    2357             : {
    2358             :         set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
    2359             : }
    2360             : 
    2361             : static inline void clear_tsk_need_resched(struct task_struct *tsk)
    2362             : {
    2363             :         clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
    2364             : }
    2365             : 
    2366             : static inline int test_tsk_need_resched(struct task_struct *tsk)
    2367             : {
    2368             :         return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
    2369             : }
    2370             : 
    2371             : static inline int restart_syscall(void)
    2372             : {
    2373             :         set_tsk_thread_flag(current, TIF_SIGPENDING);
    2374             :         return -ERESTARTNOINTR;
    2375             : }
    2376             : 
    2377             : static inline int signal_pending(struct task_struct *p)
    2378             : {
    2379             :         return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
    2380             : }
    2381             : 
    2382             : static inline int __fatal_signal_pending(struct task_struct *p)
    2383             : {
    2384             :         return unlikely(sigismember(&p->pending.signal, SIGKILL));
    2385             : }
    2386             : 
    2387             : static inline int fatal_signal_pending(struct task_struct *p)
    2388             : {
    2389             :         return signal_pending(p) && __fatal_signal_pending(p);
    2390             : }
    2391             : 
    2392             : static inline int signal_pending_state(long state, struct task_struct *p)
    2393             : {
    2394             :         if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
    2395             :                 return 0;
    2396             :         if (!signal_pending(p))
    2397             :                 return 0;
    2398             : 
    2399             :         return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
    2400             : }
    2401             : 
    2402             : static inline int need_resched(void)
    2403             : {
    2404             :         return unlikely(test_thread_flag(TIF_NEED_RESCHED));
    2405             : }
    2406             : 
    2407             : /*
    2408             :  * cond_resched() and cond_resched_lock(): latency reduction via
    2409             :  * explicit rescheduling in places that are safe. The return
    2410             :  * value indicates whether a reschedule was done in fact.
    2411             :  * cond_resched_lock() will drop the spinlock before scheduling,
    2412             :  * cond_resched_softirq() will enable bhs before scheduling.
    2413             :  */
    2414             : extern int _cond_resched(void);
    2415             : 
    2416             : #define cond_resched() ({                       \
    2417             :         __might_sleep(__FILE__, __LINE__, 0);   \
    2418             :         _cond_resched();                        \
    2419             : })
    2420             : 
    2421             : extern int __cond_resched_lock(spinlock_t *lock);
    2422             : 
    2423             : #ifdef CONFIG_PREEMPT
    2424             : #define PREEMPT_LOCK_OFFSET     PREEMPT_OFFSET
    2425             : #else
    2426             : #define PREEMPT_LOCK_OFFSET     0
    2427             : #endif
    2428             : 
    2429             : #define cond_resched_lock(lock) ({                              \
    2430             :         __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
    2431             :         __cond_resched_lock(lock);                              \
    2432             : })
    2433             : 
    2434             : extern int __cond_resched_softirq(void);
    2435             : 
    2436             : #define cond_resched_softirq() ({                               \
    2437             :         __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET);      \
    2438             :         __cond_resched_softirq();                               \
    2439             : })
    2440             : 
    2441             : /*
    2442             :  * Does a critical section need to be broken due to another
    2443             :  * task waiting?: (technically does not depend on CONFIG_PREEMPT,
    2444             :  * but a general need for low latency)
    2445             :  */
    2446             : static inline int spin_needbreak(spinlock_t *lock)
    2447             : {
    2448             : #ifdef CONFIG_PREEMPT
    2449             :         return spin_is_contended(lock);
    2450             : #else
    2451             :         return 0;
    2452             : #endif
    2453             : }
    2454             : 
    2455             : /*
    2456             :  * Thread group CPU time accounting.
    2457             :  */
    2458             : void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
    2459             : void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
    2460             : 
    2461             : static inline void thread_group_cputime_init(struct signal_struct *sig)
    2462             : {
    2463             :         sig->cputimer.cputime = INIT_CPUTIME;
    2464             :         spin_lock_init(&sig->cputimer.lock);
    2465             :         sig->cputimer.running = 0;
    2466             : }
    2467             : 
    2468             : static inline void thread_group_cputime_free(struct signal_struct *sig)
    2469             : {
    2470             : }
    2471             : 
    2472             : /*
    2473             :  * Reevaluate whether the task has signals pending delivery.
    2474             :  * Wake the task if so.
    2475             :  * This is required every time the blocked sigset_t changes.
    2476             :  * callers must hold sighand->siglock.
    2477             :  */
    2478             : extern void recalc_sigpending_and_wake(struct task_struct *t);
    2479             : extern void recalc_sigpending(void);
    2480             : 
    2481             : extern void signal_wake_up(struct task_struct *t, int resume_stopped);
    2482             : 
    2483             : /*
    2484             :  * Wrappers for p->thread_info->cpu access. No-op on UP.
    2485             :  */
    2486             : #ifdef CONFIG_SMP
    2487             : 
    2488             : static inline unsigned int task_cpu(const struct task_struct *p)
    2489             : {
    2490             :         return task_thread_info(p)->cpu;
    2491             : }
    2492             : 
    2493             : extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
    2494             : 
    2495             : #else
    2496             : 
    2497             : static inline unsigned int task_cpu(const struct task_struct *p)
    2498             : {
    2499             :         return 0;
    2500             : }
    2501             : 
    2502             : static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
    2503             : {
    2504             : }
    2505             : 
    2506             : #endif /* CONFIG_SMP */
    2507             : 
    2508             : #ifdef CONFIG_TRACING
    2509             : extern void
    2510             : __trace_special(void *__tr, void *__data,
    2511             :                 unsigned long arg1, unsigned long arg2, unsigned long arg3);
    2512             : #else
    2513             : static inline void
    2514             : __trace_special(void *__tr, void *__data,
    2515             :                 unsigned long arg1, unsigned long arg2, unsigned long arg3)
    2516             : {
    2517             : }
    2518             : #endif
    2519             : 
    2520             : extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
    2521             : extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
    2522             : 
    2523             : extern void normalize_rt_tasks(void);
    2524             : 
    2525             : #ifdef CONFIG_GROUP_SCHED
    2526             : 
    2527             : extern struct task_group init_task_group;
    2528             : #ifdef CONFIG_USER_SCHED
    2529             : extern struct task_group root_task_group;
    2530             : extern void set_tg_uid(struct user_struct *user);
    2531             : #endif
    2532             : 
    2533             : extern struct task_group *sched_create_group(struct task_group *parent);
    2534             : extern void sched_destroy_group(struct task_group *tg);
    2535             : extern void sched_move_task(struct task_struct *tsk);
    2536             : #ifdef CONFIG_FAIR_GROUP_SCHED
    2537             : extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
    2538             : extern unsigned long sched_group_shares(struct task_group *tg);
    2539             : #endif
    2540             : #ifdef CONFIG_RT_GROUP_SCHED
    2541             : extern int sched_group_set_rt_runtime(struct task_group *tg,
    2542             :                                       long rt_runtime_us);
    2543             : extern long sched_group_rt_runtime(struct task_group *tg);
    2544             : extern int sched_group_set_rt_period(struct task_group *tg,
    2545             :                                       long rt_period_us);
    2546             : extern long sched_group_rt_period(struct task_group *tg);
    2547             : extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
    2548             : #endif
    2549             : #endif
    2550             : 
    2551             : extern int task_can_switch_user(struct user_struct *up,
    2552             :                                         struct task_struct *tsk);
    2553             : 
    2554             : #ifdef CONFIG_TASK_XACCT
    2555             : static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
    2556             : {
    2557             :         tsk->ioac.rchar += amt;
    2558             : }
    2559             : 
    2560             : static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
    2561             : {
    2562             :         tsk->ioac.wchar += amt;
    2563             : }
    2564             : 
    2565             : static inline void inc_syscr(struct task_struct *tsk)
    2566             : {
    2567             :         tsk->ioac.syscr++;
    2568             : }
    2569             : 
    2570             : static inline void inc_syscw(struct task_struct *tsk)
    2571             : {
    2572             :         tsk->ioac.syscw++;
    2573             : }
    2574             : #else
    2575             : static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
    2576             : {
    2577             : }
    2578             : 
    2579             : static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
    2580             : {
    2581             : }
    2582             : 
    2583             : static inline void inc_syscr(struct task_struct *tsk)
    2584             : {
    2585             : }
    2586             : 
    2587             : static inline void inc_syscw(struct task_struct *tsk)
    2588             : {
    2589             : }
    2590             : #endif
    2591             : 
    2592             : #ifndef TASK_SIZE_OF
    2593             : #define TASK_SIZE_OF(tsk)       TASK_SIZE
    2594             : #endif
    2595             : 
    2596             : /*
    2597             :  * Call the function if the target task is executing on a CPU right now:
    2598             :  */
    2599             : extern void task_oncpu_function_call(struct task_struct *p,
    2600             :                                      void (*func) (void *info), void *info);
    2601             : 
    2602             : 
    2603             : #ifdef CONFIG_MM_OWNER
    2604             : extern void mm_update_next_owner(struct mm_struct *mm);
    2605             : extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
    2606             : #else
    2607             : static inline void mm_update_next_owner(struct mm_struct *mm)
    2608             : {
    2609             : }
    2610             : 
    2611             : static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
    2612             : {
    2613             : }
    2614             : #endif /* CONFIG_MM_OWNER */
    2615             : 
    2616             : static inline unsigned long task_rlimit(const struct task_struct *tsk,
    2617             :                 unsigned int limit)
    2618             : {
    2619             :         return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
    2620             : }
    2621             : 
    2622             : static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
    2623             :                 unsigned int limit)
    2624             : {
    2625             :         return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
    2626             : }
    2627             : 
    2628             : static inline unsigned long rlimit(unsigned int limit)
    2629             : {
    2630             :         return task_rlimit(current, limit);
    2631             : }
    2632             : 
    2633             : static inline unsigned long rlimit_max(unsigned int limit)
    2634             : {
    2635             :         return task_rlimit_max(current, limit);
    2636             : }
    2637           1 : 
    2638           1 : #endif /* __KERNEL__ */
    2639           1 : 
    2640           1 : #endif

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