diff options
| author |   Jiri Olsa <jolsa@redhat.com> | 2009-07-08 12:10:31 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2009-07-09 17:06:58 -0700 |
| commit | ad46276952f1af34cd91d46d49ba13d347d56367 (patch) | |
| tree | 55cf35156794ab34d8a607c25fd044c37231f9e4 /include/linux/spinlock.h | |
| parent | net: adding memory barrier to the poll and receive callbacks (diff) | |
| download | linux-dev-ad46276952f1af34cd91d46d49ba13d347d56367.tar.xz linux-dev-ad46276952f1af34cd91d46d49ba13d347d56367.zip | |
memory barrier: adding smp_mb__after_lock
Adding smp_mb__after_lock define to be used as a smp_mb call after
a lock.
Making it nop for x86, since {read|write|spin}_lock() on x86 are
full memory barriers.
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/spinlock.h')
| -rw-r--r-- | include/linux/spinlock.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index 252b245cfcf4..4be57ab03478 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -132,6 +132,11 @@ do { \ #endif /*__raw_spin_is_contended*/ #endif +/* The lock does not imply full memory barrier. */ +#ifndef ARCH_HAS_SMP_MB_AFTER_LOCK +static inline void smp_mb__after_lock(void) { smp_mb(); } +#endif + /** * spin_unlock_wait - wait until the spinlock gets unlocked * @lock: the spinlock in question. |