diff --git a/kernel/locking/semaphore.c b/kernel/locking/semaphore.c index 34bfae72f2952..de9117c0e671e 100644 --- a/kernel/locking/semaphore.c +++ b/kernel/locking/semaphore.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -38,7 +39,7 @@ static noinline void __down(struct semaphore *sem); static noinline int __down_interruptible(struct semaphore *sem); static noinline int __down_killable(struct semaphore *sem); static noinline int __down_timeout(struct semaphore *sem, long timeout); -static noinline void __up(struct semaphore *sem); +static noinline void __up(struct semaphore *sem, struct wake_q_head *wake_q); /** * down - acquire the semaphore @@ -183,13 +184,16 @@ EXPORT_SYMBOL(down_timeout); void __sched up(struct semaphore *sem) { unsigned long flags; + DEFINE_WAKE_Q(wake_q); raw_spin_lock_irqsave(&sem->lock, flags); if (likely(list_empty(&sem->wait_list))) sem->count++; else - __up(sem); + __up(sem, &wake_q); raw_spin_unlock_irqrestore(&sem->lock, flags); + if (!wake_q_empty(&wake_q)) + wake_up_q(&wake_q); } EXPORT_SYMBOL(up); @@ -269,11 +273,12 @@ static noinline int __sched __down_timeout(struct semaphore *sem, long timeout) return __down_common(sem, TASK_UNINTERRUPTIBLE, timeout); } -static noinline void __sched __up(struct semaphore *sem) +static noinline void __sched __up(struct semaphore *sem, + struct wake_q_head *wake_q) { struct semaphore_waiter *waiter = list_first_entry(&sem->wait_list, struct semaphore_waiter, list); list_del(&waiter->list); waiter->up = true; - wake_up_process(waiter->task); + wake_q_add(wake_q, waiter->task); }