diff options
Diffstat (limited to 'include/asm-sparc64/atomic.h')
| -rw-r--r-- | include/asm-sparc64/atomic.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h index e175afcf2cd..8198c3d0d00 100644 --- a/include/asm-sparc64/atomic.h +++ b/include/asm-sparc64/atomic.h @@ -70,6 +70,18 @@ extern int atomic64_sub_ret(int, atomic64_t *); #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0) #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0) +#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) + +#define atomic_add_unless(v, a, u) \ +({ \ + int c, old; \ + c = atomic_read(v); \ + while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ + c = old; \ + c != (u); \ +}) +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) + /* Atomic operations are already serializing */ #ifdef CONFIG_SMP #define smp_mb__before_atomic_dec() membar_storeload_loadload(); |