X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Fasm-arm%2Fatomic.h;h=ea88aa6bfc78e91c9d0442ab2b504e3ddabe1c56;hb=refs%2Fheads%2Fvserver;hp=2885972b0855cafb87e922641560d3fcd9c4c2d8;hpb=f7f1b0f1e2fbadeab12d24236000e778aa9b1ead;p=linux-2.6.git

diff --git a/include/asm-arm/atomic.h b/include/asm-arm/atomic.h
index 2885972b0..ea88aa6bf 100644
--- a/include/asm-arm/atomic.h
+++ b/include/asm-arm/atomic.h
@@ -11,7 +11,7 @@
 #ifndef __ASM_ARM_ATOMIC_H
 #define __ASM_ARM_ATOMIC_H
 
-#include <linux/config.h>
+#include <linux/compiler.h>
 
 typedef struct { volatile int counter; } atomic_t;
 
@@ -80,6 +80,24 @@ static inline int atomic_sub_return(int i, atomic_t *v)
 	return result;
 }
 
+static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
+{
+	unsigned long oldval, res;
+
+	do {
+		__asm__ __volatile__("@ atomic_cmpxchg\n"
+		"ldrex	%1, [%2]\n"
+		"mov	%0, #0\n"
+		"teq	%1, %3\n"
+		"strexeq %0, %4, [%2]\n"
+		    : "=&r" (res), "=&r" (oldval)
+		    : "r" (&ptr->counter), "Ir" (old), "r" (new)
+		    : "cc");
+	} while (res);
+
+	return oldval;
+}
+
 static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
 {
 	unsigned long tmp, tmp2;
@@ -110,10 +128,10 @@ static inline int atomic_add_return(int i, atomic_t *v)
 	unsigned long flags;
 	int val;
 
-	local_irq_save(flags);
+	raw_local_irq_save(flags);
 	val = v->counter;
 	v->counter = val += i;
-	local_irq_restore(flags);
+	raw_local_irq_restore(flags);
 
 	return val;
 }
@@ -123,25 +141,52 @@ static inline int atomic_sub_return(int i, atomic_t *v)
 	unsigned long flags;
 	int val;
 
-	local_irq_save(flags);
+	raw_local_irq_save(flags);
 	val = v->counter;
 	v->counter = val -= i;
-	local_irq_restore(flags);
+	raw_local_irq_restore(flags);
 
 	return val;
 }
 
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+	int ret;
+	unsigned long flags;
+
+	raw_local_irq_save(flags);
+	ret = v->counter;
+	if (likely(ret == old))
+		v->counter = new;
+	raw_local_irq_restore(flags);
+
+	return ret;
+}
+
 static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
 {
 	unsigned long flags;
 
-	local_irq_save(flags);
+	raw_local_irq_save(flags);
 	*addr &= ~mask;
-	local_irq_restore(flags);
+	raw_local_irq_restore(flags);
 }
 
 #endif /* __LINUX_ARM_ARCH__ */
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+	int c, old;
+
+	c = atomic_read(v);
+	while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
+		c = old;
+	return c != u;
+}
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
 #define atomic_add(i, v)	(void) atomic_add_return(i, v)
 #define atomic_inc(v)		(void) atomic_add_return(1, v)
 #define atomic_sub(i, v)	(void) atomic_sub_return(i, v)
@@ -161,5 +206,6 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
 #define smp_mb__before_atomic_inc()	barrier()
 #define smp_mb__after_atomic_inc()	barrier()
 
+#include <asm-generic/atomic.h>
 #endif
 #endif