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| author | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2007-05-08 00:34:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:15:19 -0700 |
| commit | e12f644bd085ce64a6ecca4e466fcdc2c2df4c0f (patch) | |
| tree | fef1105bc80332945ca73fa77b3aae27e9b92bdc | |
| parent | 819791319becde19e32788a34cc2556aef9f9e6d (diff) | |
| download | linux-e12f644bd085ce64a6ecca4e466fcdc2c2df4c0f.tar.bz2 | |
atomic.h: add atomic64 cmpxchg, xchg and add_unless to mips
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/asm-mips/atomic.h | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/include/asm-mips/atomic.h b/include/asm-mips/atomic.h index 1ac50b6c47ad..6423ffa195a4 100644 --- a/include/asm-mips/atomic.h +++ b/include/asm-mips/atomic.h @@ -306,8 +306,8 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v) return result; } -#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) -#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) +#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) +#define atomic_xchg(v, new) (xchg(&((v)->counter), (new))) /** * atomic_add_unless - add unless the number is a given value @@ -320,7 +320,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v) */ #define atomic_add_unless(v, a, u) \ ({ \ - int c, old; \ + __typeof__((v)->counter) c, old; \ c = atomic_read(v); \ while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ c = old; \ @@ -681,6 +681,29 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v) return result; } +#define atomic64_cmpxchg(v, o, n) \ + (((__typeof__((v)->counter)))cmpxchg(&((v)->counter), (o), (n))) +#define atomic64_xchg(v, new) (xchg(&((v)->counter), (new))) + +/** + * atomic64_add_unless - add unless the number is a given value + * @v: pointer of type atomic64_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, so long as it was not @u. + * Returns non-zero if @v was not @u, and zero otherwise. + */ +#define atomic64_add_unless(v, a, u) \ +({ \ + __typeof__((v)->counter) c, old; \ + c = atomic_read(v); \ + while (c != (u) && (old = atomic64_cmpxchg((v), c, c + (a))) != c) \ + c = old; \ + c != (u); \ +}) +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) + #define atomic64_dec_return(v) atomic64_sub_return(1,(v)) #define atomic64_inc_return(v) atomic64_add_return(1,(v)) |