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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2007-05-08 03:34:36 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 14:15:19 -0400
commit79d365a306c3af53d8a732fec79b76c0b285d816 (patch)
tree1fa4e6fd55f46b715e7b3286e65e935dd2faff5f /include/asm-x86_64/atomic.h
parent2549c8589cc0550f0714d32720877d7af133ae40 (diff)
atomic.h: add atomic64 cmpxchg, xchg and add_unless to x86_64
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-x86_64/atomic.h')
-rw-r--r--include/asm-x86_64/atomic.h36
1 files changed, 32 insertions, 4 deletions
diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index 706ca4b60000..80e4fdbe2204 100644
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -375,8 +375,8 @@ static __inline__ long atomic64_add_return(long i, atomic64_t *v)
375 long __i = i; 375 long __i = i;
376 __asm__ __volatile__( 376 __asm__ __volatile__(
377 LOCK_PREFIX "xaddq %0, %1;" 377 LOCK_PREFIX "xaddq %0, %1;"
378 :"=r"(i) 378 :"+r" (i), "+m" (v->counter)
379 :"m"(v->counter), "0"(i)); 379 : : "memory");
380 return i + __i; 380 return i + __i;
381} 381}
382 382
@@ -388,7 +388,10 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
388#define atomic64_inc_return(v) (atomic64_add_return(1,v)) 388#define atomic64_inc_return(v) (atomic64_add_return(1,v))
389#define atomic64_dec_return(v) (atomic64_sub_return(1,v)) 389#define atomic64_dec_return(v) (atomic64_sub_return(1,v))
390 390
391#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) 391#define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
392#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
393
394#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
392#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) 395#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
393 396
394/** 397/**
@@ -402,7 +405,7 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
402 */ 405 */
403#define atomic_add_unless(v, a, u) \ 406#define atomic_add_unless(v, a, u) \
404({ \ 407({ \
405 int c, old; \ 408 __typeof__((v)->counter) c, old; \
406 c = atomic_read(v); \ 409 c = atomic_read(v); \
407 for (;;) { \ 410 for (;;) { \
408 if (unlikely(c == (u))) \ 411 if (unlikely(c == (u))) \
@@ -416,6 +419,31 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
416}) 419})
417#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) 420#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
418 421
422/**
423 * atomic64_add_unless - add unless the number is a given value
424 * @v: pointer of type atomic64_t
425 * @a: the amount to add to v...
426 * @u: ...unless v is equal to u.
427 *
428 * Atomically adds @a to @v, so long as it was not @u.
429 * Returns non-zero if @v was not @u, and zero otherwise.
430 */
431#define atomic64_add_unless(v, a, u) \
432({ \
433 __typeof__((v)->counter) c, old; \
434 c = atomic64_read(v); \
435 for (;;) { \
436 if (unlikely(c == (u))) \
437 break; \
438 old = atomic64_cmpxchg((v), c, c + (a)); \
439 if (likely(old == c)) \
440 break; \
441 c = old; \
442 } \
443 c != (u); \
444})
445#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
446
419/* These are x86-specific, used by some header files */ 447/* These are x86-specific, used by some header files */
420#define atomic_clear_mask(mask, addr) \ 448#define atomic_clear_mask(mask, addr) \
421__asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \ 449__asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \