diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/atomic.h | 4 | ||||
| -rw-r--r-- | include/linux/atomic.h | 14 |
2 files changed, 16 insertions, 2 deletions
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h index 7f84414c5f53..bd18bfd78e9b 100644 --- a/include/asm-generic/atomic.h +++ b/include/asm-generic/atomic.h @@ -129,13 +129,13 @@ static inline void atomic_dec(atomic_t *v) #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) -static inline int atomic_add_unless(atomic_t *v, int a, int u) +static inline int __atomic_add_unless(atomic_t *v, int a, int u) { int c, old; c = atomic_read(v); while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c) c = old; - return c != u; + return c; } static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) diff --git a/include/linux/atomic.h b/include/linux/atomic.h index 66fed6364122..d5e167a6a398 100644 --- a/include/linux/atomic.h +++ b/include/linux/atomic.h @@ -3,6 +3,20 @@ #include <asm/atomic.h> /** + * atomic_add_unless - add unless the number is already a given value + * @v: pointer of type atomic_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, so long as @v was not already @u. + * Returns non-zero if @v was not @u, and zero otherwise. + */ +static inline int atomic_add_unless(atomic_t *v, int a, int u) +{ + return __atomic_add_unless(v, a, u) != u; +} + +/** * atomic_inc_not_zero - increment unless the number is zero * @v: pointer of type atomic_t * |