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locking/semaphore: Add might_sleep() to down_*() family

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Semaphore is sleeping lock. Add might_sleep() to down*() family
(with exception of down_trylock()) to detect atomic context sleep.

Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210809021215.19991-1-nixiaoming@huawei.com
This commit is contained in:
Xiaoming Ni 2021-08-09 10:12:15 +08:00 committed by Peter Zijlstra
parent b857174e68
commit 99409b935c
1 changed files with 4 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
kernel/locking/semaphore.c
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@ -54,6 +54,7 @@ void down(struct semaphore *sem)
{
unsigned long flags;
might_sleep();
raw_spin_lock_irqsave(&sem->lock, flags);
if (likely(sem->count > 0))
sem->count--;
@ -77,6 +78,7 @@ int down_interruptible(struct semaphore *sem)
unsigned long flags;
int result = 0;
might_sleep();
raw_spin_lock_irqsave(&sem->lock, flags);
if (likely(sem->count > 0))
sem->count--;
@ -103,6 +105,7 @@ int down_killable(struct semaphore *sem)
unsigned long flags;
int result = 0;
might_sleep();
raw_spin_lock_irqsave(&sem->lock, flags);
if (likely(sem->count > 0))
sem->count--;
@ -157,6 +160,7 @@ int down_timeout(struct semaphore *sem, long timeout)
unsigned long flags;
int result = 0;
might_sleep();
raw_spin_lock_irqsave(&sem->lock, flags);
if (likely(sem->count > 0))
sem->count--;