X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=include%2Fasm-xtensa%2Fatomic.h;h=b3b23540f14d2c5087e4b8d09d519378e73e726a;hb=6c5d523826dc639df709ed0f88c5d2ce25379652;hp=d72bcb32ba4f74ce3d3863559f14170d8937d050;hpb=d2f6409584e2c62ffad81690562330ff3bf4a458;p=linux-block.git

diff --git a/include/asm-xtensa/atomic.h b/include/asm-xtensa/atomic.h
index d72bcb32ba4f..b3b23540f14d 100644
--- 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
@@ -66,7 +65,7 @@ typedef struct { volatile int counter; } atomic_t;
  *
  * Atomically adds @i to @v.
  */
-extern __inline__ void atomic_add(int i, atomic_t * v)
+static inline void atomic_add(int i, atomic_t * v)
 {
     unsigned int vval;
 
@@ -90,7 +89,7 @@ extern __inline__ void atomic_add(int i, atomic_t * v)
  *
  * Atomically subtracts @i from @v.
  */
-extern __inline__ void atomic_sub(int i, atomic_t *v)
+static inline void atomic_sub(int i, atomic_t *v)
 {
     unsigned int vval;
 
@@ -111,7 +110,7 @@ extern __inline__ void atomic_sub(int i, atomic_t *v)
  * We use atomic_{add|sub}_return to define other functions.
  */
 
-extern __inline__ int atomic_add_return(int i, atomic_t * v)
+static inline int atomic_add_return(int i, atomic_t * v)
 {
      unsigned int vval;
 
@@ -130,7 +129,7 @@ extern __inline__ int atomic_add_return(int i, atomic_t * v)
     return vval;
 }
 
-extern __inline__ int atomic_sub_return(int i, atomic_t * v)
+static inline int atomic_sub_return(int i, atomic_t * v)
 {
     unsigned int vval;
 
@@ -223,8 +222,36 @@ extern __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))
 
-extern __inline__ void atomic_clear_mask(unsigned int mask, atomic_t *v)
+/**
+ * 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.
+ */
+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)
+
+static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
 {
     unsigned int all_f = -1;
     unsigned int vval;
@@ -243,7 +270,7 @@ extern __inline__ void atomic_clear_mask(unsigned int mask, atomic_t *v)
 	);
 }
 
-extern __inline__ void atomic_set_mask(unsigned int mask, atomic_t *v)
+static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
 {
     unsigned int vval;
 
@@ -266,6 +293,7 @@ extern __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 */