[PATCH] md: support adding new devices to md arrays via sysfs

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

diff --git a/include/asm-parisc/atomic.h b/include/asm-parisc/atomic.h
index 048a2c7fd0c0a54530fdabb5350915652fa1e2c0..64ebd086c40d231f4d7eb0e39c10f957cc69b50c 100644 (file)
--- a/include/asm-parisc/atomic.h
+++ b/include/asm-parisc/atomic.h
@@ -164,6 +164,26 @@ static __inline__ int atomic_read(const atomic_t *v)
 }
 
 /* exported interface */
+#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)
 
 #define atomic_add(i,v)        ((void)(__atomic_add_return( ((int)i),(v))))
 #define atomic_sub(i,v)        ((void)(__atomic_add_return(-((int)i),(v))))
@@ -196,4 +216,5 @@ static __inline__ int atomic_read(const atomic_t *v)
 #define smp_mb__before_atomic_inc()    smp_mb()
 #define smp_mb__after_atomic_inc()     smp_mb()
 
+#include <asm-generic/atomic.h>
 #endif