diff options
Diffstat (limited to 'include/asm-ia64/atomic.h')
| -rw-r--r-- | include/asm-ia64/atomic.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-ia64/atomic.h b/include/asm-ia64/atomic.h index 593d3da9f3c2..2fbebf85c31d 100644 --- a/include/asm-ia64/atomic.h +++ b/include/asm-ia64/atomic.h @@ -90,6 +90,16 @@ ia64_atomic64_sub (__s64 i, atomic64_t *v) #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) +#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) + #define atomic_add_return(i,v) \ ({ \ int __ia64_aar_i = (i); \ |