diff options
Diffstat (limited to 'include/linux/atomic.h')
| -rw-r--r-- | include/linux/atomic.h | 14 |
1 files changed, 14 insertions, 0 deletions
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 * |