From 0332db5aff3eec73eead6d991782b0dee1376dc0 Mon Sep 17 00:00:00 2001 From: Hirokazu Takata Date: Mon, 28 Nov 2005 13:43:59 -0800 Subject: [PATCH] m32r: Introduce atomic_cmpxchg and atomic_inc_not_zero operations Introduce atomic_cmpxchg and atomic_inc_not_zero operations for m32r. Signed-off-by: Hayato Fujiwara Signed-off-by: Hirokazu Takata Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-m32r/atomic.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'include/asm-m32r/atomic.h') diff --git a/include/asm-m32r/atomic.h b/include/asm-m32r/atomic.h index bfff69a49936..ef1fb8ea4726 100644 --- a/include/asm-m32r/atomic.h +++ b/include/asm-m32r/atomic.h @@ -242,6 +242,27 @@ static __inline__ int atomic_dec_return(atomic_t *v) */ #define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0) +#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) + +/** + * atomic_add_unless - add unless the number is a given value + * @v: pointer of type atomic_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 atomic_add_unless(v, a, u) \ +({ \ + int c, old; \ + c = atomic_read(v); \ + while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ + c = old; \ + c != (u); \ +}) +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) + static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t *addr) { unsigned long flags; -- cgit v1.2.2