x86: create asm/cmpxchg.h

[linux-2.6-omap-h63xx.git] / include / asm-i386 / atomic.h

diff --git a/include/asm-i386/atomic.h b/include/asm-i386/atomic.h
index 4dd272331361c7eb747305366810fc92c28b3b08..b9fd03cef51ecf16dc8b9009f92255b81811e9aa 100644 (file)
--- a/include/asm-i386/atomic.h
+++ b/include/asm-i386/atomic.h
@@ -3,6 +3,7 @@
 
 #include <linux/compiler.h>
 #include <asm/processor.h>
+#include <asm/cmpxchg.h>
 
 /*
  * Atomic operations that C can't guarantee us.  Useful for
@@ -207,8 +208,8 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v)
        return atomic_add_return(-i,v);
 }
 
-#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
 
 /**
  * atomic_add_unless - add unless the number is already a given value
@@ -219,20 +220,21 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v)
  * Atomically adds @a to @v, so long as @v was not already @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);                                     \
-       for (;;) {                                              \
-               if (unlikely(c == (u)))                         \
-                       break;                                  \
-               old = atomic_cmpxchg((v), c, c + (a));          \
-               if (likely(old == c))                           \
-                       break;                                  \
-               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_inc_return(v)  (atomic_add_return(1,v))