Commit 41806ef4 authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Paul Mackerras
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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: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 8c0238b3

include/asm-powerpc/atomic.h

+39 −1
Original line number Diff line number Diff line
@@ -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>