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atomic.h: add atomic64 cmpxchg, xchg and add_unless to parisc 

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Acked-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mathieu Desnoyers 2007-05-08 00:34:26 -07:00 committed by Linus Torvalds
parent e12f644bd0
commit 8ffe9d0bff
1 changed files with 26 additions and 3 deletions
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29
include/asm-parisc/atomic.h
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@ -6,7 +6,6 @@
#define _ASM_PARISC_ATOMIC_H_
#include <linux/types.h>
#include <asm/system.h>
/*
* Atomic operations that C can't guarantee us. Useful for
@ -163,7 +162,7 @@ static __inline__ int atomic_read(const atomic_t *v)
}
/* exported interface */
#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))
/**
@ -177,7 +176,7 @@ static __inline__ int atomic_read(const 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; \
@ -270,6 +269,30 @@ atomic64_read(const atomic64_t *v)
#define atomic64_dec_and_test(v) (atomic64_dec_return(v) == 0)
#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i),(v)) == 0)
/* exported interface */
#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 = atomic64_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)
#endif /* CONFIG_64BIT */
#include <asm-generic/atomic.h>