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authorSegher Boessenkool <segher@kernel.crashing.org>2007-08-11 10:15:30 +1000
committerPaul Mackerras <paulus@samba.org>2007-08-17 11:01:58 +1000
commit9f0cbea0d8cc47801b853d3c61d0e17475b0cc89 (patch)
treeb1cd6fe848a7544a834d0073297193069c24c7dd /include/asm-powerpc/atomic.h
parentc6d4267eced79775399f256fbb4adb671e9b597e (diff)
downloadop-kernel-dev-9f0cbea0d8cc47801b853d3c61d0e17475b0cc89.zip
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[POWERPC] Implement atomic{, 64}_{read, write}() without volatile
Instead, use asm() like all other atomic operations already do. Also use inline functions instead of macros; this actually improves code generation (some code becomes a little smaller, probably because of improved alias information -- just a few hundred bytes total on a default kernel build, nothing shocking). Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-powerpc/atomic.h')
-rw-r--r--include/asm-powerpc/atomic.h34
1 files changed, 28 insertions, 6 deletions
diff --git a/include/asm-powerpc/atomic.h b/include/asm-powerpc/atomic.h
index c44810b..f3fc733 100644
--- a/include/asm-powerpc/atomic.h
+++ b/include/asm-powerpc/atomic.h
@@ -5,7 +5,7 @@
* PowerPC atomic operations
*/
-typedef struct { volatile int counter; } atomic_t;
+typedef struct { int counter; } atomic_t;
#ifdef __KERNEL__
#include <linux/compiler.h>
@@ -15,8 +15,19 @@ typedef struct { volatile int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
-#define atomic_read(v) ((v)->counter)
-#define atomic_set(v,i) (((v)->counter) = (i))
+static __inline__ int atomic_read(const atomic_t *v)
+{
+ int t;
+
+ __asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));
+
+ return t;
+}
+
+static __inline__ void atomic_set(atomic_t *v, int i)
+{
+ __asm__ __volatile__("stw%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i));
+}
static __inline__ void atomic_add(int a, atomic_t *v)
{
@@ -240,12 +251,23 @@ static __inline__ int atomic_dec_if_positive(atomic_t *v)
#ifdef __powerpc64__
-typedef struct { volatile long counter; } atomic64_t;
+typedef struct { long counter; } atomic64_t;
#define ATOMIC64_INIT(i) { (i) }
-#define atomic64_read(v) ((v)->counter)
-#define atomic64_set(v,i) (((v)->counter) = (i))
+static __inline__ long atomic64_read(const atomic64_t *v)
+{
+ long t;
+
+ __asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));
+
+ return t;
+}
+
+static __inline__ void atomic64_set(atomic64_t *v, long i)
+{
+ __asm__ __volatile__("std%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i));
+}
static __inline__ void atomic64_add(long a, atomic64_t *v)
{
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