LCOV - code coverage report
Current view: top level - lkbce/include/linux - irq.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 2 2 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       1             : #ifndef _LINUX_IRQ_H
       2             : #define _LINUX_IRQ_H
       3             : 
       4             : /*
       5             :  * Please do not include this file in generic code.  There is currently
       6             :  * no requirement for any architecture to implement anything held
       7             :  * within this file.
       8             :  *
       9             :  * Thanks. --rmk
      10             :  */
      11             : 
      12             : #include <linux/smp.h>
      13             : 
      14             : #ifndef CONFIG_S390
      15             : 
      16             : #include <linux/linkage.h>
      17             : #include <linux/cache.h>
      18             : #include <linux/spinlock.h>
      19             : #include <linux/cpumask.h>
      20             : #include <linux/gfp.h>
      21             : #include <linux/irqreturn.h>
      22             : #include <linux/irqnr.h>
      23             : #include <linux/errno.h>
      24             : #include <linux/topology.h>
      25             : #include <linux/wait.h>
      26             : 
      27             : #include <asm/irq.h>
      28             : #include <asm/ptrace.h>
      29             : #include <asm/irq_regs.h>
      30             : 
      31             : struct irq_desc;
      32             : typedef void (*irq_flow_handler_t)(unsigned int irq,
      33           1 :                                             struct irq_desc *desc);
      34             : 
      35             : 
      36             : /*
      37             :  * IRQ line status.
      38             :  *
      39             :  * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
      40             :  *
      41             :  * IRQ types
      42             :  */
      43             : #define IRQ_TYPE_NONE           0x00000000      /* Default, unspecified type */
      44             : #define IRQ_TYPE_EDGE_RISING    0x00000001      /* Edge rising type */
      45             : #define IRQ_TYPE_EDGE_FALLING   0x00000002      /* Edge falling type */
      46             : #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
      47             : #define IRQ_TYPE_LEVEL_HIGH     0x00000004      /* Level high type */
      48             : #define IRQ_TYPE_LEVEL_LOW      0x00000008      /* Level low type */
      49             : #define IRQ_TYPE_SENSE_MASK     0x0000000f      /* Mask of the above */
      50             : #define IRQ_TYPE_PROBE          0x00000010      /* Probing in progress */
      51             : 
      52             : /* Internal flags */
      53             : #define IRQ_INPROGRESS          0x00000100      /* IRQ handler active - do not enter! */
      54             : #define IRQ_DISABLED            0x00000200      /* IRQ disabled - do not enter! */
      55             : #define IRQ_PENDING             0x00000400      /* IRQ pending - replay on enable */
      56             : #define IRQ_REPLAY              0x00000800      /* IRQ has been replayed but not acked yet */
      57             : #define IRQ_AUTODETECT          0x00001000      /* IRQ is being autodetected */
      58             : #define IRQ_WAITING             0x00002000      /* IRQ not yet seen - for autodetection */
      59             : #define IRQ_LEVEL               0x00004000      /* IRQ level triggered */
      60             : #define IRQ_MASKED              0x00008000      /* IRQ masked - shouldn't be seen again */
      61             : #define IRQ_PER_CPU             0x00010000      /* IRQ is per CPU */
      62             : #define IRQ_NOPROBE             0x00020000      /* IRQ is not valid for probing */
      63             : #define IRQ_NOREQUEST           0x00040000      /* IRQ cannot be requested */
      64             : #define IRQ_NOAUTOEN            0x00080000      /* IRQ will not be enabled on request irq */
      65             : #define IRQ_WAKEUP              0x00100000      /* IRQ triggers system wakeup */
      66             : #define IRQ_MOVE_PENDING        0x00200000      /* need to re-target IRQ destination */
      67             : #define IRQ_NO_BALANCING        0x00400000      /* IRQ is excluded from balancing */
      68             : #define IRQ_SPURIOUS_DISABLED   0x00800000      /* IRQ was disabled by the spurious trap */
      69             : #define IRQ_MOVE_PCNTXT         0x01000000      /* IRQ migration from process context */
      70             : #define IRQ_AFFINITY_SET        0x02000000      /* IRQ affinity was set from userspace*/
      71             : #define IRQ_SUSPENDED           0x04000000      /* IRQ has gone through suspend sequence */
      72             : #define IRQ_ONESHOT             0x08000000      /* IRQ is not unmasked after hardirq */
      73             : #define IRQ_NESTED_THREAD       0x10000000      /* IRQ is nested into another, no own handler thread */
      74             : 
      75             : #ifdef CONFIG_IRQ_PER_CPU
      76             : # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
      77             : # define IRQ_NO_BALANCING_MASK  (IRQ_PER_CPU | IRQ_NO_BALANCING)
      78             : #else
      79             : # define CHECK_IRQ_PER_CPU(var) 0
      80             : # define IRQ_NO_BALANCING_MASK  IRQ_NO_BALANCING
      81             : #endif
      82             : 
      83             : struct proc_dir_entry;
      84             : struct msi_desc;
      85             : 
      86             : /**
      87             :  * struct irq_chip - hardware interrupt chip descriptor
      88             :  *
      89             :  * @name:               name for /proc/interrupts
      90             :  * @startup:            start up the interrupt (defaults to ->enable if NULL)
      91             :  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
      92             :  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
      93             :  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
      94             :  * @ack:                start of a new interrupt
      95             :  * @mask:               mask an interrupt source
      96             :  * @mask_ack:           ack and mask an interrupt source
      97             :  * @unmask:             unmask an interrupt source
      98             :  * @eoi:                end of interrupt - chip level
      99             :  * @end:                end of interrupt - flow level
     100             :  * @set_affinity:       set the CPU affinity on SMP machines
     101             :  * @retrigger:          resend an IRQ to the CPU
     102             :  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
     103             :  * @set_wake:           enable/disable power-management wake-on of an IRQ
     104             :  *
     105             :  * @bus_lock:           function to lock access to slow bus (i2c) chips
     106             :  * @bus_sync_unlock:    function to sync and unlock slow bus (i2c) chips
     107             :  *
     108             :  * @release:            release function solely used by UML
     109             :  * @typename:           obsoleted by name, kept as migration helper
     110             :  */
     111             : struct irq_chip {
     112             :         const char      *name;
     113             :         unsigned int    (*startup)(unsigned int irq);
     114             :         void            (*shutdown)(unsigned int irq);
     115             :         void            (*enable)(unsigned int irq);
     116             :         void            (*disable)(unsigned int irq);
     117             : 
     118             :         void            (*ack)(unsigned int irq);
     119             :         void            (*mask)(unsigned int irq);
     120             :         void            (*mask_ack)(unsigned int irq);
     121             :         void            (*unmask)(unsigned int irq);
     122             :         void            (*eoi)(unsigned int irq);
     123             : 
     124             :         void            (*end)(unsigned int irq);
     125             :         int             (*set_affinity)(unsigned int irq,
     126             :                                         const struct cpumask *dest);
     127             :         int             (*retrigger)(unsigned int irq);
     128             :         int             (*set_type)(unsigned int irq, unsigned int flow_type);
     129             :         int             (*set_wake)(unsigned int irq, unsigned int on);
     130             : 
     131             :         void            (*bus_lock)(unsigned int irq);
     132             :         void            (*bus_sync_unlock)(unsigned int irq);
     133             : 
     134             :         /* Currently used only by UML, might disappear one day.*/
     135             : #ifdef CONFIG_IRQ_RELEASE_METHOD
     136             :         void            (*release)(unsigned int irq, void *dev_id);
     137             : #endif
     138             :         /*
     139             :          * For compatibility, ->typename is copied into ->name.
     140             :          * Will disappear.
     141             :          */
     142             :         const char      *typename;
     143             : };
     144             : 
     145             : struct timer_rand_state;
     146           1 : struct irq_2_iommu;
     147             : /**
     148             :  * struct irq_desc - interrupt descriptor
     149             :  * @irq:                interrupt number for this descriptor
     150             :  * @timer_rand_state:   pointer to timer rand state struct
     151             :  * @kstat_irqs:         irq stats per cpu
     152             :  * @irq_2_iommu:        iommu with this irq
     153             :  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
     154             :  * @chip:               low level interrupt hardware access
     155             :  * @msi_desc:           MSI descriptor
     156             :  * @handler_data:       per-IRQ data for the irq_chip methods
     157             :  * @chip_data:          platform-specific per-chip private data for the chip
     158             :  *                      methods, to allow shared chip implementations
     159             :  * @action:             the irq action chain
     160             :  * @status:             status information
     161             :  * @depth:              disable-depth, for nested irq_disable() calls
     162             :  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
     163             :  * @irq_count:          stats field to detect stalled irqs
     164             :  * @last_unhandled:     aging timer for unhandled count
     165             :  * @irqs_unhandled:     stats field for spurious unhandled interrupts
     166             :  * @lock:               locking for SMP
     167             :  * @affinity:           IRQ affinity on SMP
     168             :  * @node:               node index useful for balancing
     169             :  * @pending_mask:       pending rebalanced interrupts
     170             :  * @threads_active:     number of irqaction threads currently running
     171             :  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
     172             :  * @dir:                /proc/irq/ procfs entry
     173             :  * @name:               flow handler name for /proc/interrupts output
     174             :  */
     175             : struct irq_desc {
     176             :         unsigned int            irq;
     177             :         struct timer_rand_state *timer_rand_state;
     178             :         unsigned int            *kstat_irqs;
     179             : #ifdef CONFIG_INTR_REMAP
     180             :         struct irq_2_iommu      *irq_2_iommu;
     181             : #endif
     182             :         irq_flow_handler_t      handle_irq;
     183             :         struct irq_chip         *chip;
     184             :         struct msi_desc         *msi_desc;
     185             :         void                    *handler_data;
     186             :         void                    *chip_data;
     187             :         struct irqaction        *action;        /* IRQ action list */
     188             :         unsigned int            status;         /* IRQ status */
     189             : 
     190             :         unsigned int            depth;          /* nested irq disables */
     191             :         unsigned int            wake_depth;     /* nested wake enables */
     192             :         unsigned int            irq_count;      /* For detecting broken IRQs */
     193             :         unsigned long           last_unhandled; /* Aging timer for unhandled count */
     194             :         unsigned int            irqs_unhandled;
     195             :         raw_spinlock_t          lock;
     196             : #ifdef CONFIG_SMP
     197             :         cpumask_var_t           affinity;
     198             :         unsigned int            node;
     199             : #ifdef CONFIG_GENERIC_PENDING_IRQ
     200             :         cpumask_var_t           pending_mask;
     201             : #endif
     202             : #endif
     203             :         atomic_t                threads_active;
     204             :         wait_queue_head_t       wait_for_threads;
     205             : #ifdef CONFIG_PROC_FS
     206             :         struct proc_dir_entry   *dir;
     207             : #endif
     208             :         const char              *name;
     209             : } ____cacheline_internodealigned_in_smp;
     210             : 
     211             : extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
     212             :                                         struct irq_desc *desc, int node);
     213             : extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
     214             : 
     215             : #ifndef CONFIG_SPARSE_IRQ
     216             : extern struct irq_desc irq_desc[NR_IRQS];
     217             : #endif
     218             : 
     219             : #ifdef CONFIG_NUMA_IRQ_DESC
     220             : extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
     221             : #else
     222             : static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
     223             : {
     224             :         return desc;
     225             : }
     226             : #endif
     227             : 
     228             : extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
     229             : 
     230             : /*
     231             :  * Pick up the arch-dependent methods:
     232             :  */
     233             : #include <asm/hw_irq.h>
     234             : 
     235             : extern int setup_irq(unsigned int irq, struct irqaction *new);
     236             : extern void remove_irq(unsigned int irq, struct irqaction *act);
     237             : 
     238             : #ifdef CONFIG_GENERIC_HARDIRQS
     239             : 
     240             : #ifdef CONFIG_SMP
     241             : 
     242             : #ifdef CONFIG_GENERIC_PENDING_IRQ
     243             : 
     244             : void move_native_irq(int irq);
     245             : void move_masked_irq(int irq);
     246             : 
     247             : #else /* CONFIG_GENERIC_PENDING_IRQ */
     248             : 
     249             : static inline void move_irq(int irq)
     250             : {
     251             : }
     252             : 
     253             : static inline void move_native_irq(int irq)
     254             : {
     255             : }
     256             : 
     257             : static inline void move_masked_irq(int irq)
     258             : {
     259             : }
     260             : 
     261             : #endif /* CONFIG_GENERIC_PENDING_IRQ */
     262             : 
     263             : #else /* CONFIG_SMP */
     264             : 
     265             : #define move_native_irq(x)
     266             : #define move_masked_irq(x)
     267             : 
     268             : #endif /* CONFIG_SMP */
     269             : 
     270             : extern int no_irq_affinity;
     271             : 
     272             : static inline int irq_balancing_disabled(unsigned int irq)
     273             : {
     274             :         struct irq_desc *desc;
     275             : 
     276             :         desc = irq_to_desc(irq);
     277             :         return desc->status & IRQ_NO_BALANCING_MASK;
     278             : }
     279             : 
     280             : /* Handle irq action chains: */
     281             : extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
     282             : 
     283             : /*
     284             :  * Built-in IRQ handlers for various IRQ types,
     285             :  * callable via desc->handle_irq()
     286             :  */
     287             : extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
     288             : extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
     289             : extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
     290             : extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
     291             : extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
     292             : extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
     293             : extern void handle_nested_irq(unsigned int irq);
     294             : 
     295             : /*
     296             :  * Monolithic do_IRQ implementation.
     297             :  */
     298             : #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
     299             : extern unsigned int __do_IRQ(unsigned int irq);
     300             : #endif
     301             : 
     302             : /*
     303             :  * Architectures call this to let the generic IRQ layer
     304             :  * handle an interrupt. If the descriptor is attached to an
     305             :  * irqchip-style controller then we call the ->handle_irq() handler,
     306             :  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
     307             :  */
     308             : static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
     309             : {
     310             : #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
     311             :         desc->handle_irq(irq, desc);
     312             : #else
     313             :         if (likely(desc->handle_irq))
     314             :                 desc->handle_irq(irq, desc);
     315             :         else
     316             :                 __do_IRQ(irq);
     317             : #endif
     318             : }
     319             : 
     320             : static inline void generic_handle_irq(unsigned int irq)
     321             : {
     322             :         generic_handle_irq_desc(irq, irq_to_desc(irq));
     323             : }
     324             : 
     325             : /* Handling of unhandled and spurious interrupts: */
     326             : extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
     327             :                            irqreturn_t action_ret);
     328             : 
     329             : /* Resending of interrupts :*/
     330             : void check_irq_resend(struct irq_desc *desc, unsigned int irq);
     331             : 
     332             : /* Enable/disable irq debugging output: */
     333             : extern int noirqdebug_setup(char *str);
     334             : 
     335             : /* Checks whether the interrupt can be requested by request_irq(): */
     336             : extern int can_request_irq(unsigned int irq, unsigned long irqflags);
     337             : 
     338             : /* Dummy irq-chip implementations: */
     339             : extern struct irq_chip no_irq_chip;
     340             : extern struct irq_chip dummy_irq_chip;
     341             : 
     342             : extern void
     343             : set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
     344             :                          irq_flow_handler_t handle);
     345             : extern void
     346             : set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
     347             :                               irq_flow_handler_t handle, const char *name);
     348             : 
     349             : extern void
     350             : __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
     351             :                   const char *name);
     352             : 
     353             : /* caller has locked the irq_desc and both params are valid */
     354             : static inline void __set_irq_handler_unlocked(int irq,
     355             :                                               irq_flow_handler_t handler)
     356             : {
     357             :         struct irq_desc *desc;
     358             : 
     359             :         desc = irq_to_desc(irq);
     360             :         desc->handle_irq = handler;
     361             : }
     362             : 
     363             : /*
     364             :  * Set a highlevel flow handler for a given IRQ:
     365             :  */
     366             : static inline void
     367             : set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
     368             : {
     369             :         __set_irq_handler(irq, handle, 0, NULL);
     370             : }
     371             : 
     372             : /*
     373             :  * Set a highlevel chained flow handler for a given IRQ.
     374             :  * (a chained handler is automatically enabled and set to
     375             :  *  IRQ_NOREQUEST and IRQ_NOPROBE)
     376             :  */
     377             : static inline void
     378             : set_irq_chained_handler(unsigned int irq,
     379             :                         irq_flow_handler_t handle)
     380             : {
     381             :         __set_irq_handler(irq, handle, 1, NULL);
     382             : }
     383             : 
     384             : extern void set_irq_nested_thread(unsigned int irq, int nest);
     385             : 
     386             : extern void set_irq_noprobe(unsigned int irq);
     387             : extern void set_irq_probe(unsigned int irq);
     388             : 
     389             : /* Handle dynamic irq creation and destruction */
     390             : extern unsigned int create_irq_nr(unsigned int irq_want, int node);
     391             : extern int create_irq(void);
     392             : extern void destroy_irq(unsigned int irq);
     393             : 
     394             : /* Test to see if a driver has successfully requested an irq */
     395             : static inline int irq_has_action(unsigned int irq)
     396             : {
     397             :         struct irq_desc *desc = irq_to_desc(irq);
     398             :         return desc->action != NULL;
     399             : }
     400             : 
     401             : /* Dynamic irq helper functions */
     402             : extern void dynamic_irq_init(unsigned int irq);
     403             : void dynamic_irq_init_keep_chip_data(unsigned int irq);
     404             : extern void dynamic_irq_cleanup(unsigned int irq);
     405             : void dynamic_irq_cleanup_keep_chip_data(unsigned int irq);
     406             : 
     407             : /* Set/get chip/data for an IRQ: */
     408             : extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
     409             : extern int set_irq_data(unsigned int irq, void *data);
     410             : extern int set_irq_chip_data(unsigned int irq, void *data);
     411             : extern int set_irq_type(unsigned int irq, unsigned int type);
     412             : extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
     413             : 
     414             : #define get_irq_chip(irq)       (irq_to_desc(irq)->chip)
     415             : #define get_irq_chip_data(irq)  (irq_to_desc(irq)->chip_data)
     416             : #define get_irq_data(irq)       (irq_to_desc(irq)->handler_data)
     417             : #define get_irq_msi(irq)        (irq_to_desc(irq)->msi_desc)
     418             : 
     419             : #define get_irq_desc_chip(desc)         ((desc)->chip)
     420             : #define get_irq_desc_chip_data(desc)    ((desc)->chip_data)
     421             : #define get_irq_desc_data(desc)         ((desc)->handler_data)
     422             : #define get_irq_desc_msi(desc)          ((desc)->msi_desc)
     423             : 
     424             : #endif /* CONFIG_GENERIC_HARDIRQS */
     425             : 
     426             : #endif /* !CONFIG_S390 */
     427             : 
     428             : #ifdef CONFIG_SMP
     429             : /**
     430             :  * alloc_desc_masks - allocate cpumasks for irq_desc
     431             :  * @desc:       pointer to irq_desc struct
     432             :  * @node:       node which will be handling the cpumasks
     433             :  * @boot:       true if need bootmem
     434             :  *
     435             :  * Allocates affinity and pending_mask cpumask if required.
     436             :  * Returns true if successful (or not required).
     437             :  */
     438             : static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
     439             :                                                         bool boot)
     440             : {
     441             :         gfp_t gfp = GFP_ATOMIC;
     442             : 
     443             :         if (boot)
     444             :                 gfp = GFP_NOWAIT;
     445             : 
     446             : #ifdef CONFIG_CPUMASK_OFFSTACK
     447             :         if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
     448             :                 return false;
     449             : 
     450             : #ifdef CONFIG_GENERIC_PENDING_IRQ
     451             :         if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
     452             :                 free_cpumask_var(desc->affinity);
     453             :                 return false;
     454             :         }
     455             : #endif
     456             : #endif
     457             :         return true;
     458             : }
     459             : 
     460             : static inline void init_desc_masks(struct irq_desc *desc)
     461             : {
     462             :         cpumask_setall(desc->affinity);
     463             : #ifdef CONFIG_GENERIC_PENDING_IRQ
     464             :         cpumask_clear(desc->pending_mask);
     465             : #endif
     466             : }
     467             : 
     468             : /**
     469             :  * init_copy_desc_masks - copy cpumasks for irq_desc
     470             :  * @old_desc:   pointer to old irq_desc struct
     471             :  * @new_desc:   pointer to new irq_desc struct
     472             :  *
     473             :  * Insures affinity and pending_masks are copied to new irq_desc.
     474             :  * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
     475             :  * irq_desc struct so the copy is redundant.
     476             :  */
     477             : 
     478             : static inline void init_copy_desc_masks(struct irq_desc *old_desc,
     479             :                                         struct irq_desc *new_desc)
     480             : {
     481             : #ifdef CONFIG_CPUMASK_OFFSTACK
     482             :         cpumask_copy(new_desc->affinity, old_desc->affinity);
     483             : 
     484             : #ifdef CONFIG_GENERIC_PENDING_IRQ
     485             :         cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
     486             : #endif
     487             : #endif
     488             : }
     489             : 
     490             : static inline void free_desc_masks(struct irq_desc *old_desc,
     491             :                                    struct irq_desc *new_desc)
     492             : {
     493             :         free_cpumask_var(old_desc->affinity);
     494             : 
     495             : #ifdef CONFIG_GENERIC_PENDING_IRQ
     496             :         free_cpumask_var(old_desc->pending_mask);
     497             : #endif
     498             : }
     499             : 
     500             : #else /* !CONFIG_SMP */
     501             : 
     502             : static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
     503             :                                                                 bool boot)
     504             : {
     505             :         return true;
     506             : }
     507             : 
     508             : static inline void init_desc_masks(struct irq_desc *desc)
     509             : {
     510             : }
     511             : 
     512             : static inline void init_copy_desc_masks(struct irq_desc *old_desc,
     513             :                                         struct irq_desc *new_desc)
     514             : {
     515             : }
     516             : 
     517             : static inline void free_desc_masks(struct irq_desc *old_desc,
     518             :                                    struct irq_desc *new_desc)
     519             : {
     520             : }
     521             : #endif  /* CONFIG_SMP */
     522             : 
     523             : #endif /* _LINUX_IRQ_H */

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