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Commit e12f644b 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 mips 



Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 81979131

include/asm-mips/atomic.h

+26 −3
Original line number Diff line number Diff line
@@ -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))