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

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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>
This commit is contained in:
Mathieu Desnoyers 2007-05-08 00:34:24 -07:00 committed by Linus Torvalds
parent 819791319b
commit e12f644bd0
1 changed files with 26 additions and 3 deletions
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29
include/asm-mips/atomic.h
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@ -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))