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| author | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2007-05-08 00:34:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:15:19 -0700 |
| commit | 2549c8589cc0550f0714d32720877d7af133ae40 (patch) | |
| tree | e481403722dab01dc61e724c5c1669af60fc4eda | |
| parent | f46e477ed94f6407982690ef53dab7898834268f (diff) | |
| download | lwn-2549c8589cc0550f0714d32720877d7af133ae40.tar.gz lwn-2549c8589cc0550f0714d32720877d7af133ae40.zip | |
atomic.h: add atomic64 cmpxchg, xchg and add_unless to sparc64
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/asm-sparc64/atomic.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h index 2f0bec26a695..c3feb3af2cfe 100644 --- a/include/asm-sparc64/atomic.h +++ b/include/asm-sparc64/atomic.h @@ -70,12 +70,12 @@ extern int atomic64_sub_ret(int, atomic64_t *); #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0) #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0) -#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) +#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) #define atomic_add_unless(v, a, u) \ ({ \ - int c, old; \ + __typeof__((v)->counter) c, old; \ c = atomic_read(v); \ for (;;) { \ if (unlikely(c == (u))) \ @@ -89,6 +89,26 @@ extern int atomic64_sub_ret(int, atomic64_t *); }) #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) +#define atomic64_cmpxchg(v, o, n) \ + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) +#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) + +#define atomic64_add_unless(v, a, u) \ +({ \ + __typeof__((v)->counter) c, old; \ + c = atomic64_read(v); \ + for (;;) { \ + if (unlikely(c == (u))) \ + break; \ + old = atomic64_cmpxchg((v), c, c + (a)); \ + if (likely(old == c)) \ + break; \ + c = old; \ + } \ + likely(c != (u)); \ +}) +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) + /* Atomic operations are already serializing */ #ifdef CONFIG_SMP #define smp_mb__before_atomic_dec() membar_storeload_loadload(); |