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[POWERPC] atomic.h: Add atomic64 cmpxchg, xchg and add_unless to powerpc 

atomic.h : Add atomic64 cmpxchg, xchg and add_unless to powerpc

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Mathieu Desnoyers 2007-01-25 11:15:52 -05:00 committed by Paul Mackerras
parent 8c0238b3f1
commit 41806ef4bf
1 changed files with 39 additions and 1 deletions
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40
include/asm-powerpc/atomic.h
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@ -165,7 +165,8 @@ static __inline__ int atomic_dec_return(atomic_t *v)
return t;
}
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_cmpxchg(v, o, n) \
((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
@ -413,6 +414,43 @@ static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
return t;
}
#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.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
long t;
__asm__ __volatile__ (
LWSYNC_ON_SMP
"1: ldarx %0,0,%1 # atomic_add_unless\n\
cmpd 0,%0,%3 \n\
beq- 2f \n\
add %0,%2,%0 \n"
" stdcx. %0,0,%1 \n\
bne- 1b \n"
ISYNC_ON_SMP
" subf %0,%2,%0 \n\
2:"
: "=&r" (t)
: "r" (&v->counter), "r" (a), "r" (u)
: "cc", "memory");
return t != u;
}
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
#endif /* __powerpc64__ */
#include <asm-generic/atomic.h>