diff options
Diffstat (limited to 'include/asm-i386/atomic.h')
| -rw-r--r-- | include/asm-i386/atomic.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/asm-i386/atomic.h b/include/asm-i386/atomic.h index 78b0032d1f2..22d80ece95c 100644 --- a/include/asm-i386/atomic.h +++ b/include/asm-i386/atomic.h @@ -225,8 +225,14 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v) ({ \ int c, old; \ c = atomic_read(v); \ - while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ + for (;;) { \ + if (unlikely(c == (u))) \ + break; \ + old = atomic_cmpxchg((v), c, c + (a)); \ + if (likely(old == c)) \ + break; \ c = old; \ + } \ c != (u); \ }) #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |