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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-07-27 00:54:47 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-07-27 00:54:47 -0700 |
| commit | aa7eb8e78d8ecd6cd0475d86ea8385ff9cb47ece (patch) | |
| tree | 3f9e98fadd5124fb05e8f6f9b06aa23698d4f215 /include/linux/seqlock.h | |
| parent | cca8edfd2ec2a34d9f50f593bc753bb11e1bc1f5 (diff) | |
| parent | 3c6b50141ef9f0a8844bf1357b80c0cdf518bf05 (diff) | |
Merge branch 'next' into for-linus
Diffstat (limited to 'include/linux/seqlock.h')
| -rw-r--r-- | include/linux/seqlock.h | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h index e98cd2e5719..c6db9fb33c4 100644 --- a/include/linux/seqlock.h +++ b/include/linux/seqlock.h @@ -28,6 +28,7 @@ #include <linux/spinlock.h> #include <linux/preempt.h> +#include <asm/processor.h> typedef struct { unsigned sequence; @@ -41,9 +42,6 @@ typedef struct { #define __SEQLOCK_UNLOCKED(lockname) \ { 0, __SPIN_LOCK_UNLOCKED(lockname) } -#define SEQLOCK_UNLOCKED \ - __SEQLOCK_UNLOCKED(old_style_seqlock_init) - #define seqlock_init(x) \ do { \ (x)->sequence = 0; \ @@ -88,12 +86,12 @@ static __always_inline unsigned read_seqbegin(const seqlock_t *sl) unsigned ret; repeat: - ret = sl->sequence; - smp_rmb(); + ret = ACCESS_ONCE(sl->sequence); if (unlikely(ret & 1)) { cpu_relax(); goto repeat; } + smp_rmb(); return ret; } |