X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=include%2Fasm-alpha%2Fatomic.h;h=f5cb7b878af25ba2dd69abb0343327db8c183dd4;hb=380517dead6ab86d7249a1723f07f2f1b10af5f6;hp=20ac3d95ecd9ae34ab3fcba2c58a5656c72be6d7;hpb=c7fb577e2a6cb04732541f2dc402bd46747f7558;p=~andy%2Flinux

diff --git a/include/asm-alpha/atomic.h b/include/asm-alpha/atomic.h
index 20ac3d95ecd..f5cb7b878af 100644
--- a/include/asm-alpha/atomic.h
+++ b/include/asm-alpha/atomic.h
@@ -2,6 +2,7 @@
 #define _ALPHA_ATOMIC_H
 
 #include <asm/barrier.h>
+#include <asm/system.h>
 
 /*
  * Atomic operations that C can't guarantee us.  Useful for
@@ -118,8 +119,6 @@ static __inline__ long atomic_add_return(int i, atomic_t * v)
 	return result;
 }
 
-#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
-
 static __inline__ long atomic64_add_return(long i, atomic64_t * v)
 {
 	long temp, result;
@@ -177,6 +176,67 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
 	return result;
 }
 
+#define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
+#define atomic64_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 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)
+
+/**
+ * atomic64_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic64_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 atomic64_add_unless(atomic64_t *v, long a, long u)
+{
+	long c, old;
+	c = atomic64_read(v);
+	for (;;) {
+		if (unlikely(c == (u)))
+			break;
+		old = atomic64_cmpxchg((v), c, c + (a));
+		if (likely(old == c))
+			break;
+		c = old;
+	}
+	return c != (u);
+}
+
+#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+
+#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
+#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
+
 #define atomic_dec_return(v) atomic_sub_return(1,(v))
 #define atomic64_dec_return(v) atomic64_sub_return(1,(v))
 
@@ -187,6 +247,8 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
 #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
 
 #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
+#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
+
 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
 #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
 
@@ -201,4 +263,5 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
 #define smp_mb__before_atomic_inc()	smp_mb()
 #define smp_mb__after_atomic_inc()	smp_mb()
 
+#include <asm-generic/atomic.h>
 #endif /* _ALPHA_ATOMIC_H */