diff options
| author | Peter Zijlstra | 2016-06-01 20:58:15 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2016-06-08 15:17:01 +0200 |
| commit | 6428671bae97caa7040e24e79e969fd87908f4f3 (patch) | |
| tree | 67549d91213b5fc3bb48a243ebfaf1ef3fc2b9a2 /firmware | |
| parent | locking/rwsem: Streamline the rwsem_optimistic_spin() code (diff) | |
| download | kernel-qcow2-linux-6428671bae97caa7040e24e79e969fd87908f4f3.tar.gz kernel-qcow2-linux-6428671bae97caa7040e24e79e969fd87908f4f3.tar.xz kernel-qcow2-linux-6428671bae97caa7040e24e79e969fd87908f4f3.zip | |
locking/mutex: Optimize mutex_trylock() fast-path
A while back Viro posted a number of 'interesting' mutex_is_locked()
users on IRC, one of those was RCU.
RCU seems to use mutex_is_locked() to avoid doing mutex_trylock(), the
regular load before modify pattern.
While the use isn't wrong per se, its curious in that its needed at all,
mutex_trylock() should be good enough on its own to avoid the pointless
cacheline bounces.
So fix those and remove the mutex_is_locked() (ab)use from RCU.
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Paul McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <Waiman.Long@hpe.com>
Link: http://lkml.kernel.org/r/20160601185815.GW3190@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'firmware')
0 files changed, 0 insertions, 0 deletions