Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6

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

diff --git a/include/asm-xtensa/atomic.h b/include/asm-xtensa/atomic.h
index 24f86f0e43cfd64c918fbe39b5b8cdb629ea9175..5c2672021068670758d9d9d3d4f8ef30abaa5705 100644 (file)
--- a/include/asm-xtensa/atomic.h
+++ b/include/asm-xtensa/atomic.h
@@ -13,7 +13,6 @@
 #ifndef _XTENSA_ATOMIC_H
 #define _XTENSA_ATOMIC_H
 
-#include <linux/config.h>
 #include <linux/stringify.h>
 
 typedef struct { volatile int counter; } atomic_t;
@@ -22,7 +21,7 @@ typedef struct { volatile int counter; } atomic_t;
 #include <asm/processor.h>
 #include <asm/system.h>
 
-#define ATOMIC_INIT(i) ( (atomic_t) { (i) } )
+#define ATOMIC_INIT(i) { (i) }
 
 /*
  * This Xtensa implementation assumes that the right mechanism
@@ -223,6 +222,27 @@ static inline int atomic_sub_return(int i, 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)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+/**
+ * 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 int mask, atomic_t *v)
 {
@@ -266,6 +286,7 @@ static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
 #define smp_mb__before_atomic_inc()    barrier()
 #define smp_mb__after_atomic_inc()     barrier()
 
+#include <asm-generic/atomic.h>
 #endif /* __KERNEL__ */
 
 #endif /* _XTENSA_ATOMIC_H */