diff options
Diffstat (limited to 'include/linux/percpu-rwsem.h')
| -rw-r--r-- | include/linux/percpu-rwsem.h | 15 |
1 files changed, 3 insertions, 12 deletions
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h index c8cb010d655e..39d5bf8e6562 100644 --- a/include/linux/percpu-rwsem.h +++ b/include/linux/percpu-rwsem.h @@ -107,6 +107,8 @@ static inline bool percpu_down_read_trylock(struct percpu_rw_semaphore *sem) return ret; } +extern void __percpu_up_read(struct percpu_rw_semaphore *sem); + static inline void percpu_up_read(struct percpu_rw_semaphore *sem) { rwsem_release(&sem->dep_map, _RET_IP_); @@ -118,18 +120,7 @@ static inline void percpu_up_read(struct percpu_rw_semaphore *sem) if (likely(rcu_sync_is_idle(&sem->rss))) { this_cpu_dec(*sem->read_count); } else { - /* - * slowpath; reader will only ever wake a single blocked - * writer. - */ - smp_mb(); /* B matches C */ - /* - * In other words, if they see our decrement (presumably to - * aggregate zero, as that is the only time it matters) they - * will also see our critical section. - */ - this_cpu_dec(*sem->read_count); - rcuwait_wake_up(&sem->writer); + __percpu_up_read(sem); } preempt_enable(); } |