Xie Yongji 0d086c4edc locking/rwsem: Fix (possible) missed wakeup ...

[ Upstream commit e158488be2 ]

Because wake_q_add() can imply an immediate wakeup (cmpxchg failure
case), we must not rely on the wakeup being delayed. However, commit:

  e38513905e ("locking/rwsem: Rework zeroing reader waiter->task")

relies on exactly that behaviour in that the wakeup must not happen
until after we clear waiter->task.

[ peterz: Added changelog. ]

Signed-off-by: Xie Yongji <xieyongji@baidu.com>
Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: e38513905e ("locking/rwsem: Rework zeroing reader waiter->task")
Link: https://lkml.kernel.org/r/1543495830-2644-1-git-send-email-xieyongji@baidu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2019-03-05 17:59:39 +01:00

..

lockdep_internals.h

locking/lockdep: Make class->ops a percpu counter and move it under CONFIG_DEBUG_LOCKDEP=y

2018-10-09 09:56:33 +02:00

lockdep_proc.c

locking/lockdep: Make class->ops a percpu counter and move it under CONFIG_DEBUG_LOCKDEP=y

2018-10-09 09:56:33 +02:00

lockdep_states.h

locking/lockdep: Rework FS_RECLAIM annotation

2017-08-10 12:29:03 +02:00

lockdep.c

locking/lockdep: Fix debug_locks off performance problem

2018-10-19 07:53:17 +02:00

locktorture.c

Merge tag 'drm-next-2018-08-15' of git://anongit.freedesktop.org/drm/drm

2018-08-15 17:39:07 -07:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

mcs_spinlock.h

locking/mcs: Use smp_cond_load_acquire() in MCS spin loop

2018-04-27 09:48:49 +02:00

mutex-debug.c

locking/mutex: Rework mutex::owner

2016-10-25 11:31:50 +02:00

mutex-debug.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

mutex.c

locking/mutex: Fix mutex debug call and ww_mutex documentation

2018-09-10 10:05:10 +02:00

mutex.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

osq_lock.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

percpu-rwsem.c

locking/percpu-rwsem: Replace waitqueue with rcuwait

2017-01-14 11:14:35 +01:00

qrwlock.c

locking/qrwlock: Prevent slowpath writers getting held up by fastpath

2017-10-25 10:57:25 +02:00

qspinlock_paravirt.h

mm: remove include/linux/bootmem.h

2018-10-31 08:54:16 -07:00

qspinlock_stat.h

locking/qspinlock_stat: Count instances of nested lock slowpaths

2018-10-17 08:37:31 +02:00

qspinlock.c

locking/pvqspinlock: Extend node size when pvqspinlock is configured

2018-10-17 08:37:32 +02:00

rtmutex_common.h

locking/rtmutex: Handle non enqueued waiters gracefully in remove_waiter()

2018-03-28 23:01:30 +02:00

rtmutex-debug.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rtmutex-debug.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rtmutex.c

futex: Handle early deadlock return correctly

2019-02-12 20:02:36 +01:00

rtmutex.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rwsem-spinlock.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rwsem-xadd.c

locking/rwsem: Fix (possible) missed wakeup

2019-03-05 17:59:39 +01:00

rwsem.c

locking/rwsem: Make owner store task pointer of last owning reader

2018-09-10 12:04:07 +02:00

rwsem.h

locking/rwsem: Make owner store task pointer of last owning reader

2018-09-10 12:04:07 +02:00

semaphore.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

spinlock_debug.c

locking/spinlock/debug: Remove spinlock lockup detection code

2017-02-10 09:09:49 +01:00

spinlock.c

locking/core: Remove break_lock field when CONFIG_GENERIC_LOCKBREAK=y

2017-12-12 11:24:01 +01:00

test-ww_mutex.c

locking/ww_mutex: Fix runtime warning in the WW mutex selftest

2018-10-03 08:56:31 +02:00