diff options
| author | Cliff Wickman <cpw@sgi.com> | 2008-06-04 15:33:17 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-08 12:23:23 +0200 |
| commit | 73e991f45fe7644711c0c9dd357a1a2c6e222707 (patch) | |
| tree | 16e10a4774791b8ecf8046546f36af3fbb0bac51 | |
| parent | 1812924bb1823950c1dc95c478b71b037057356e (diff) | |
x86 atomic operations: atomic_or_long() atomic_inc_short()
Provide atomic operations for increment of a 16-bit integer and
logical OR into a 64-bit integer.
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Reviewed-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/asm-x86/atomic_64.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-x86/atomic_64.h b/include/asm-x86/atomic_64.h index 3e0cd7d38335..55c0dd9382b8 100644 --- a/include/asm-x86/atomic_64.h +++ b/include/asm-x86/atomic_64.h @@ -431,6 +431,32 @@ static inline int atomic64_add_unless(atomic64_t *v, long a, long u) return c != (u); } +/** + * atomic_inc_short - increment of a short integer + * @v: pointer to type int + * + * Atomically adds 1 to @v + * Returns the new value of @u + */ +static inline short int atomic_inc_short(short int *v) +{ + asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v)); + return *v; +} + +/** + * atomic_or_long - OR of two long integers + * @v1: pointer to type unsigned long + * @v2: pointer to type unsigned long + * + * Atomically ORs @v1 and @v2 + * Returns the result of the OR + */ +static inline void atomic_or_long(unsigned long *v1, unsigned long v2) +{ + asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2)); +} + #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) /* These are x86-specific, used by some header files */ |