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locking/ww_mutex: Split up ww_mutex_unlock()

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Split the ww related part out into a helper function so it can be reused
for a rtmutex based ww_mutex implementation.

[ mingo: Fixed bisection failure. ]

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211304.340166556@linutronix.de
This commit is contained in:
Peter Zijlstra (Intel) 2021-08-17 16:19:04 +02:00 committed by Ingo Molnar
parent c0afb0ffc0
commit aaa77de10b
1 changed files with 15 additions and 11 deletions
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26
kernel/locking/mutex.c
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@ -744,6 +744,20 @@ void __sched mutex_unlock(struct mutex *lock)
}
EXPORT_SYMBOL(mutex_unlock);
static void __ww_mutex_unlock(struct ww_mutex *lock)
{
/*
* The unlocking fastpath is the 0->1 transition from 'locked'
* into 'unlocked' state:
*/
if (lock->ctx) {
MUTEX_WARN_ON(!lock->ctx->acquired);
if (lock->ctx->acquired > 0)
lock->ctx->acquired--;
lock->ctx = NULL;
}
}
/**
* ww_mutex_unlock - release the w/w mutex
* @lock: the mutex to be released
@ -757,17 +771,7 @@ EXPORT_SYMBOL(mutex_unlock);
*/
void __sched ww_mutex_unlock(struct ww_mutex *lock)
{
/*
* The unlocking fastpath is the 0->1 transition from 'locked'
* into 'unlocked' state:
*/
if (lock->ctx) {
MUTEX_WARN_ON(!lock->ctx->acquired);
if (lock->ctx->acquired > 0)
lock->ctx->acquired--;
lock->ctx = NULL;
}
__ww_mutex_unlock(lock);
mutex_unlock(&lock->base);
}
EXPORT_SYMBOL(ww_mutex_unlock);