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| author | Waiman Long | 2015-11-10 01:09:21 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2015-11-23 10:01:58 +0100 |
| commit | 64d816cba06c67eeee455b8c78ebcda349d49c24 (patch) | |
| tree | 4f84909ad1dbf50bfc038dde2e72285f8e98521e /include/asm-generic/unistd.h | |
| parent | atomics: Add test for atomic operations with _relaxed variants (diff) | |
| download | kernel-qcow2-linux-64d816cba06c67eeee455b8c78ebcda349d49c24.tar.gz kernel-qcow2-linux-64d816cba06c67eeee455b8c78ebcda349d49c24.tar.xz kernel-qcow2-linux-64d816cba06c67eeee455b8c78ebcda349d49c24.zip | |
locking/qspinlock: Use _acquire/_release() versions of cmpxchg() & xchg()
This patch replaces the cmpxchg() and xchg() calls in the native
qspinlock code with the more relaxed _acquire or _release versions of
those calls to enable other architectures to adopt queued spinlocks
with less memory barrier performance overhead.
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Douglas Hatch <doug.hatch@hpe.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Scott J Norton <scott.norton@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1447114167-47185-2-git-send-email-Waiman.Long@hpe.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/asm-generic/unistd.h')
0 files changed, 0 insertions, 0 deletions