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Thomas Gleixner c6a5bf4cda locking/rtmutex: Use READ_ONCE() in rt_mutex_owner() 
commit 1be5d4fa0a upstream.

While debugging the rtmutex unlock vs. dequeue race Will suggested to use
READ_ONCE() in rt_mutex_owner() as it might race against the
cmpxchg_release() in unlock_rt_mutex_safe().

Will: "It's a minor thing which will most likely not matter in practice"

Careful search did not unearth an actual problem in todays code, but it's
better to be safe than surprised.

Suggested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: David Daney <ddaney@caviumnetworks.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20161130210030.431379999@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-12-15 08:49:22 -08:00
..
lglock.c
lockdep.c treewide: Remove old email address 2015-11-23 09:44:58 +01:00
lockdep_internals.h
lockdep_proc.c treewide: Remove old email address 2015-11-23 09:44:58 +01:00
lockdep_states.h
locktorture.c Merge branches 'doc.2015.10.06a', 'percpu-rwsem.2015.10.06a' and 'torture.2015.10.06a' into HEAD 2015-10-07 16:06:25 -07:00
Makefile
mcs_spinlock.h locking/mcs: Fix mcs_spin_lock() ordering 2016-05-04 14:48:50 -07:00
mutex-debug.c
mutex-debug.h
mutex.c locking/ww_mutex: Report recursive ww_mutex locking early 2016-07-27 09:47:29 -07:00
mutex.h
osq_lock.c locking/osq: Fix ordering of node initialisation in osq_lock 2015-12-17 11:40:29 -08:00
percpu-rwsem.c
qrwlock.c
qspinlock.c locking/qspinlock: Fix spin_unlock_wait() some more 2016-07-27 09:47:29 -07:00
qspinlock_paravirt.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex.c locking/rtmutex: Prevent dequeue vs. unlock race 2016-12-15 08:49:22 -08:00
rtmutex.h
rtmutex_common.h locking/rtmutex: Use READ_ONCE() in rt_mutex_owner() 2016-12-15 08:49:22 -08:00
rwsem-spinlock.c
rwsem-xadd.c
rwsem.c
rwsem.h
semaphore.c
spinlock.c
spinlock_debug.c