Merge branch 'upstream'

[linux-2.6-omap-h63xx.git] / include / asm-sparc64 / atomic.h

diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h
index 3a0b4383bbaca3147e97712dd896366b09c8ed0f..8198c3d0d0074368b0d9fbba5d72969b403c4884 100644 (file)
--- a/include/asm-sparc64/atomic.h
+++ b/include/asm-sparc64/atomic.h
@@ -72,6 +72,16 @@ extern int atomic64_sub_ret(int, atomic64_t *);
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
 
+#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)
+
 /* Atomic operations are already serializing */
 #ifdef CONFIG_SMP
 #define smp_mb__before_atomic_dec()    membar_storeload_loadload();