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linux/kernel/locking
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Zqiang 3a010c4932 locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal 
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
2021-05-18 12:53:51 +02:00
..
irqflag-debug.c lockdep: Noinstr annotate warn_bogus_irq_restore() 2021-02-10 14:44:39 +01:00
lock_events_list.h locking/rwsem: Remove reader optimistic spinning 2020-12-09 17:08:48 +01:00
lock_events.c locking/lock_events: Don't show pvqspinlock events on bare metal 2019-04-10 10:56:05 +02:00
lock_events.h locking/lock_events: Use raw_cpu_{add,inc}() for stats 2019-06-03 12:32:56 +02:00
lockdep_internals.h lockdep: Allow tuning tracing capacity constants. 2021-04-05 20:33:57 +09:00
lockdep_proc.c locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
lockdep_states.h locking/lockdep: Rework FS_RECLAIM annotation 2017-08-10 12:29:03 +02:00
lockdep.c locking/lockdep: Correct calling tracepoints 2021-05-18 12:53:50 +02:00
locktorture.c locking/locktorture: Fix incorrect use of ww_acquire_ctx in ww_mutex test 2021-03-19 12:13:10 +01:00
Makefile locking/rtmutex: Move debug functions as inlines into common header 2021-03-29 15:57:04 +02:00
mcs_spinlock.h locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
mutex-debug.c locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal 2021-05-18 12:53:51 +02:00
mutex-debug.h locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal 2021-05-18 12:53:51 +02:00
mutex.c locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal 2021-05-18 12:53:51 +02:00
mutex.h locking/mutex: clear MUTEX_FLAGS if wait_list is empty due to signal 2021-05-18 12:53:51 +02:00
osq_lock.c locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
percpu-rwsem.c locking/percpu-rwsem: Use this_cpu_{inc,dec}() for read_count 2020-09-16 16:26:56 +02:00
qrwlock.c locking/qrwlock: Cleanup queued_write_lock_slowpath() 2021-05-06 15:33:49 +02:00
qspinlock_paravirt.h Revert "locking/pvqspinlock: Don't wait if vCPU is preempted" 2019-09-25 10:22:37 +02:00
qspinlock_stat.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
qspinlock.c x86/kvm: Add "nopvspin" parameter to disable PV spinlocks 2020-07-08 16:21:57 -04:00
rtmutex_common.h locking/rtmutex: Move debug functions as inlines into common header 2021-03-29 15:57:04 +02:00
rtmutex.c locking/rtmutex: Clean up signal handling in __rt_mutex_slowlock() 2021-03-29 15:57:05 +02:00
rwsem.c locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
semaphore.c kernel: delete repeated words in comments 2021-02-26 09:41:03 -08:00
spinlock_debug.c lockdep: Introduce wait-type checks 2020-03-21 16:00:24 +01:00
spinlock.c locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
test-ww_mutex.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 9 2019-05-21 11:28:40 +02:00