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locking/ww_mutex: Split up ww_mutex_unlock()
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
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@ -744,6 +744,20 @@ void __sched mutex_unlock(struct mutex *lock)
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}
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EXPORT_SYMBOL(mutex_unlock);
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static void __ww_mutex_unlock(struct ww_mutex *lock)
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{
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/*
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* The unlocking fastpath is the 0->1 transition from 'locked'
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* into 'unlocked' state:
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*/
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if (lock->ctx) {
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MUTEX_WARN_ON(!lock->ctx->acquired);
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if (lock->ctx->acquired > 0)
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lock->ctx->acquired--;
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lock->ctx = NULL;
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}
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}
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/**
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* ww_mutex_unlock - release the w/w mutex
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* @lock: the mutex to be released
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@ -757,17 +771,7 @@ EXPORT_SYMBOL(mutex_unlock);
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*/
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void __sched ww_mutex_unlock(struct ww_mutex *lock)
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{
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/*
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* The unlocking fastpath is the 0->1 transition from 'locked'
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* into 'unlocked' state:
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*/
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if (lock->ctx) {
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MUTEX_WARN_ON(!lock->ctx->acquired);
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if (lock->ctx->acquired > 0)
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lock->ctx->acquired--;
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lock->ctx = NULL;
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}
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__ww_mutex_unlock(lock);
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mutex_unlock(&lock->base);
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}
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EXPORT_SYMBOL(ww_mutex_unlock);
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