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Commit 2549c858 authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Linus Torvalds
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atomic.h: add atomic64 cmpxchg, xchg and add_unless to sparc64 



Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f46e477e

include/asm-sparc64/atomic.h

+22 −2
Original line number Diff line number Diff line
@@ -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();