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| author | Peter Zijlstra <peterz@infradead.org> | 2015-10-16 14:39:38 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-12-04 10:33:41 +0100 |
| commit | b3e0b1b6d841a4b2f64fc09ea728913da8218424 (patch) | |
| tree | 93df412814210f3e4d36dae4e39487aec17a431e /mm/memory-failure.c | |
| parent | 829cf31751aa1c50b1527c1e0c821c99246b5639 (diff) | |
| download | op-kernel-dev-b3e0b1b6d841a4b2f64fc09ea728913da8218424.zip op-kernel-dev-b3e0b1b6d841a4b2f64fc09ea728913da8218424.tar.gz | |
locking, sched: Introduce smp_cond_acquire() and use it
Introduce smp_cond_acquire() which combines a control dependency and a
read barrier to form acquire semantics.
This primitive has two benefits:
- it documents control dependencies,
- its typically cheaper than using smp_load_acquire() in a loop.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/memory-failure.c')
0 files changed, 0 insertions, 0 deletions
