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| author | Peter Zijlstra <peterz@infradead.org> | 2016-04-04 10:57:12 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-06-14 11:54:27 +0200 |
| commit | 1f03e8d2919270bd6ef64f39a45ce8df8a9f012a (patch) | |
| tree | 0cdd5de370212a021d0a1a3439bbc4b0a77fea8b /kernel/sched/sched.h | |
| parent | Merge branch 'linus' into locking/core, to pick up fixes before merging new c... (diff) | |
| download | linux-1f03e8d2919270bd6ef64f39a45ce8df8a9f012a.tar.xz linux-1f03e8d2919270bd6ef64f39a45ce8df8a9f012a.zip | |
locking/barriers: Replace smp_cond_acquire() with smp_cond_load_acquire()
This new form allows using hardware assisted waiting.
Some hardware (ARM64 and x86) allow monitoring an address for changes,
so by providing a pointer we can use this to replace the cpu_relax()
with hardware optimized methods in the future.
Requested-by: Will Deacon <will.deacon@arm.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
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 'kernel/sched/sched.h')
| -rw-r--r-- | kernel/sched/sched.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 72f1f3087b04..425bf5ddaa5a 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1113,7 +1113,7 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) * In particular, the load of prev->state in finish_task_switch() must * happen before this. * - * Pairs with the smp_cond_acquire() in try_to_wake_up(). + * Pairs with the smp_cond_load_acquire() in try_to_wake_up(). */ smp_store_release(&prev->on_cpu, 0); #endif |