LCOV - code coverage report
Current view: top level - include/linux - rcutree.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 1 0.0 %
Date: 2017-01-25 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Read-Copy Update mechanism for mutual exclusion (tree-based version)
       3             :  *
       4             :  * This program is free software; you can redistribute it and/or modify
       5             :  * it under the terms of the GNU General Public License as published by
       6             :  * the Free Software Foundation; either version 2 of the License, or
       7             :  * (at your option) any later version.
       8             :  *
       9             :  * This program is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             :  * GNU General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU General Public License
      15             :  * along with this program; if not, write to the Free Software
      16             :  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
      17             :  *
      18             :  * Copyright IBM Corporation, 2008
      19             :  *
      20             :  * Author: Dipankar Sarma <dipankar@in.ibm.com>
      21             :  *         Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
      22             :  *
      23             :  * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
      24             :  * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
      25             :  *
      26             :  * For detailed explanation of Read-Copy Update mechanism see -
      27             :  *      Documentation/RCU
      28             :  */
      29             : 
      30             : #ifndef __LINUX_RCUTREE_H
      31             : #define __LINUX_RCUTREE_H
      32             : 
      33             : struct notifier_block;
      34             : 
      35             : extern void rcu_sched_qs(int cpu);
      36             : extern void rcu_bh_qs(int cpu);
      37             : extern int rcu_needs_cpu(int cpu);
      38             : extern void rcu_scheduler_starting(void);
      39             : extern int rcu_expedited_torture_stats(char *page);
      40             : 
      41             : #ifdef CONFIG_TREE_PREEMPT_RCU
      42             : 
      43             : extern void __rcu_read_lock(void);
      44             : extern void __rcu_read_unlock(void);
      45             : extern void synchronize_rcu(void);
      46             : extern void exit_rcu(void);
      47             : 
      48             : /*
      49             :  * Defined as macro as it is a very low level header
      50             :  * included from areas that don't even know about current
      51             :  */
      52             : #define rcu_preempt_depth() (current->rcu_read_lock_nesting)
      53             : 
      54             : #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
      55             : 
      56             : static inline void __rcu_read_lock(void)
      57             : {
      58           0 :         preempt_disable();
      59             : }
      60             : 
      61             : static inline void __rcu_read_unlock(void)
      62             : {
      63             :         preempt_enable();
      64             : }
      65             : 
      66             : #define synchronize_rcu synchronize_sched
      67             : 
      68             : static inline void exit_rcu(void)
      69             : {
      70             : }
      71             : 
      72             : static inline int rcu_preempt_depth(void)
      73             : {
      74             :         return 0;
      75             : }
      76             : 
      77             : #endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
      78             : 
      79             : static inline void __rcu_read_lock_bh(void)
      80             : {
      81             :         local_bh_disable();
      82             : }
      83             : static inline void __rcu_read_unlock_bh(void)
      84             : {
      85             :         local_bh_enable();
      86             : }
      87             : 
      88             : extern void call_rcu_sched(struct rcu_head *head,
      89             :                            void (*func)(struct rcu_head *rcu));
      90             : extern void synchronize_rcu_expedited(void);
      91             : 
      92             : static inline void synchronize_rcu_bh_expedited(void)
      93             : {
      94             :         synchronize_sched_expedited();
      95             : }
      96             : 
      97             : extern void rcu_check_callbacks(int cpu, int user);
      98             : 
      99             : extern long rcu_batches_completed(void);
     100             : extern long rcu_batches_completed_bh(void);
     101             : extern long rcu_batches_completed_sched(void);
     102             : 
     103             : #ifdef CONFIG_NO_HZ
     104             : void rcu_enter_nohz(void);
     105             : void rcu_exit_nohz(void);
     106             : #else /* CONFIG_NO_HZ */
     107             : static inline void rcu_enter_nohz(void)
     108             : {
     109             : }
     110             : static inline void rcu_exit_nohz(void)
     111             : {
     112             : }
     113             : #endif /* CONFIG_NO_HZ */
     114             : 
     115             : /* A context switch is a grace period for RCU-sched and RCU-bh. */
     116             : static inline int rcu_blocking_is_gp(void)
     117             : {
     118             :         return num_online_cpus() == 1;
     119             : }
     120             : 
     121             : #endif /* __LINUX_RCUTREE_H */

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