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| author | Ingo Molnar <mingo@elte.hu> | 2009-04-07 11:30:17 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-07 12:02:41 +0200 |
| commit | 98c2aaf8be5baf7193be37fb28bce8e7327158bc (patch) | |
| tree | 53309d2f2cd1b4464e1336f8041779d0637a9f9b | |
| parent | 6278af660ff83fbafb18e53fc2747eb2ee6780fa (diff) | |
| download | op-kernel-dev-98c2aaf8be5baf7193be37fb28bce8e7327158bc.zip op-kernel-dev-98c2aaf8be5baf7193be37fb28bce8e7327158bc.tar.gz | |
x86, perfcounters: add atomic64_xchg()
Complete atomic64_t support on the 32-bit side by adding atomic64_xch().
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090406094518.445450972@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/include/asm/atomic_32.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/arch/x86/include/asm/atomic_32.h b/arch/x86/include/asm/atomic_32.h index 977250e..aff9f1f 100644 --- a/arch/x86/include/asm/atomic_32.h +++ b/arch/x86/include/asm/atomic_32.h @@ -291,19 +291,37 @@ atomic64_cmpxchg(atomic64_t *ptr, unsigned long long old_val, } /** - * atomic64_set - set atomic64 variable + * atomic64_xchg - xchg atomic64 variable * @ptr: pointer to type atomic64_t * @new_val: value to assign + * @old_val: old value that was there * - * Atomically sets the value of @ptr to @new_val. + * Atomically xchgs the value of @ptr to @new_val and returns + * the old value. */ -static inline void atomic64_set(atomic64_t *ptr, unsigned long long new_val) + +static inline unsigned long long +atomic64_xchg(atomic64_t *ptr, unsigned long long new_val) { unsigned long long old_val; do { old_val = atomic_read(ptr); } while (atomic64_cmpxchg(ptr, old_val, new_val) != old_val); + + return old_val; +} + +/** + * atomic64_set - set atomic64 variable + * @ptr: pointer to type atomic64_t + * @new_val: value to assign + * + * Atomically sets the value of @ptr to @new_val. + */ +static inline void atomic64_set(atomic64_t *ptr, unsigned long long new_val) +{ + atomic64_xchg(ptr, new_val); } /** |
