diff options
| author | James Morris <james.l.morris@oracle.com> | 2014-04-14 05:23:14 +0400 |
|---|---|---|
| committer | James Morris <james.l.morris@oracle.com> | 2014-04-14 05:23:14 +0400 |
| commit | ecd740c6f2f092b90b95fa35f757973589eaaca2 (patch) | |
| tree | ce02b1e18c4fc5729699251460cd8be7604d8401 /include/linux/spinlock.h | |
| parent | f64410ec665479d7b4b77b7519e814253ed0f686 (diff) | |
| parent | 455c6fdbd219161bd09b1165f11699d6d73de11c (diff) | |
| download | linux-ecd740c6f2f092b90b95fa35f757973589eaaca2.tar.xz | |
Merge commit 'v3.14' into next
Diffstat (limited to 'include/linux/spinlock.h')
| -rw-r--r-- | include/linux/spinlock.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index 75f34949d9ab..3f2867ff0ced 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -130,6 +130,16 @@ do { \ #define smp_mb__before_spinlock() smp_wmb() #endif +/* + * Place this after a lock-acquisition primitive to guarantee that + * an UNLOCK+LOCK pair act as a full barrier. This guarantee applies + * if the UNLOCK and LOCK are executed by the same CPU or if the + * UNLOCK and LOCK operate on the same lock variable. + */ +#ifndef smp_mb__after_unlock_lock +#define smp_mb__after_unlock_lock() do { } while (0) +#endif + /** * raw_spin_unlock_wait - wait until the spinlock gets unlocked * @lock: the spinlock in question. |