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authorHirokazu Takata <takata@linux-m32r.org>2005-11-28 13:43:59 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-28 14:42:24 -0800
commit0332db5aff3eec73eead6d991782b0dee1376dc0 (patch)
treebc3299c3be9f5a64591dbe1a3ab5b86991c847b3 /include/asm-m32r/atomic.h
parent91f4ab056d85d23fa6955927fdeb1558673e8cd1 (diff)
downloadop-kernel-dev-0332db5aff3eec73eead6d991782b0dee1376dc0.zip
op-kernel-dev-0332db5aff3eec73eead6d991782b0dee1376dc0.tar.gz
[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 <fujiwara@linux-m32r.org> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-m32r/atomic.h')
-rw-r--r--include/asm-m32r/atomic.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/asm-m32r/atomic.h b/include/asm-m32r/atomic.h
index bfff69a..ef1fb8e 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;
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