Zqiang 845c2b9d99 locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal ... [ Upstream commit 3a010c493271f04578b133de977e0e5dd2848cea ] When a interruptible mutex locker is interrupted by a signal without acquiring this lock and removed from the wait queue. if the mutex isn't contended enough to have a waiter put into the wait queue again, the setting of the WAITER bit will force mutex locker to go into the slowpath to acquire the lock every time, so if the wait queue is empty, the WAITER bit need to be clear. Fixes: 040a0a3710 ("mutex: Add support for wound/wait style locks") Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Zqiang <qiang.zhang@windriver.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210517034005.30828-1-qiang.zhang@windriver.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-05-26 12:05:15 +02:00
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lock_events_list.h
lock_events.c
lock_events.h
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
lockdep.c
locktorture.c
Makefile
mcs_spinlock.h
mutex-debug.c	locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal	2021-05-26 12:05:15 +02:00
mutex-debug.h	locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal	2021-05-26 12:05:15 +02:00
mutex.c	locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal	2021-05-26 12:05:15 +02:00
mutex.h	locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal	2021-05-26 12:05:15 +02:00
osq_lock.c
percpu-rwsem.c
qrwlock.c
qspinlock_paravirt.h
qspinlock_stat.h
qspinlock.c
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex.c
rtmutex.h
rwsem.c
rwsem.h
semaphore.c
spinlock_debug.c
spinlock.c
test-ww_mutex.c