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authorMathieu Desnoyers <compudj@krystal.dyndns.org>2007-05-08 00:34:38 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:20 -0700
commit2856f5e31c1413bf6e4f1371e07e17078a5fee5e (patch)
tree587dfe584f0913813d0cf2414a9378618143db15 /include/asm-m68knommu/atomic.h
parent79d365a306c3af53d8a732fec79b76c0b285d816 (diff)
atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency
atomic_add_unless as inline. Remove system.h atomic.h circular dependency. I agree (with Andi Kleen) this typeof is not needed and more error prone. All the original atomic.h code that uses cmpxchg (which includes the atomic_add_unless) uses defines instead of inline functions, probably to circumvent a circular dependency between system.h and atomic.h on powerpc (which my patch addresses). Therefore, it makes sense to use inline functions that will provide type checking. atomic_add_unless as inline. Remove system.h atomic.h circular dependency. Digging into the FRV architecture shows me that it is also affected by such a circular dependency. Here is the diff applying this against the rest of my atomic.h patches. It applies over the atomic.h standardization patches. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-m68knommu/atomic.h')
-rw-r--r--include/asm-m68knommu/atomic.h25
1 files changed, 16 insertions, 9 deletions
diff --git a/include/asm-m68knommu/atomic.h b/include/asm-m68knommu/atomic.h
index 6c4e4b63e45..d5632a305da 100644
--- a/include/asm-m68knommu/atomic.h
+++ b/include/asm-m68knommu/atomic.h
@@ -1,7 +1,7 @@
#ifndef __ARCH_M68KNOMMU_ATOMIC__
#define __ARCH_M68KNOMMU_ATOMIC__
-#include <asm/system.h> /* local_irq_XXX() */
+#include <asm/system.h>
/*
* Atomic operations that C can't guarantee us. Useful for
@@ -131,14 +131,21 @@ static inline int atomic_sub_return(int i, atomic_t * v)
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-#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); \
-})
+static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+{
+ int c, old;
+ c = atomic_read(v);
+ for (;;) {
+ if (unlikely(c == (u)))
+ break;
+ old = atomic_cmpxchg((v), c, c + (a));
+ if (likely(old == c))
+ break;
+ c = old;
+ }
+ return c != (u);
+}
+
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
#define atomic_dec_return(v) atomic_sub_return(1,(v))