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| author | Jiri Kosina <jkosina@suse.cz> | 2014-02-20 14:54:28 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2014-02-20 14:54:28 +0100 |
| commit | d4263348f796f29546f90802177865dd4379dd0a (patch) | |
| tree | adcbdaebae584eee2f32fab95e826e8e49eef385 /include/linux/spinlock.h | |
| parent | be873ac782f5ff5ee6675f83929f4fe6737eead2 (diff) | |
| parent | 6d0abeca3242a88cab8232e4acd7e2bf088f3bc2 (diff) | |
| download | blackbird-op-linux-d4263348f796f29546f90802177865dd4379dd0a.tar.gz blackbird-op-linux-d4263348f796f29546f90802177865dd4379dd0a.zip | |
Merge branch 'master' into for-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. |
