[patch 08/28] Add cmpxchg_local to avr32

Mathieu Desnoyers
2007-10-31T22:51:30Z

[-- Attachment #1: add-cmpxchg-local-to-avr32.patch --]
[-- Type: text/plain, Size: 1863 bytes --]

Use the new generic cmpxchg_local (disables interrupt) for 8, 16 and 64 bits
cmpxchg_local. Use the __cmpxchg_u32 primitive for 32 bits cmpxchg_local.

Note that cmpxchg only uses the __cmpxchg_u32 or __cmpxchg_u64 and will cause
a linker error if called with 8 or 16 bits argument.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
CC: clameter@sgi.com
CC: hskinnemoen@atmel.com
---
include/asm-avr32/system.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

Index: linux-2.6-lttng/include/asm-avr32/system.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-avr32/system.h 2007-10-31 17:32:44.000000000 -0400
+++ linux-2.6-lttng/include/asm-avr32/system.h 2007-10-31 18:00:59.000000000 -0400
@@ -140,6 +140,29 @@ static inline unsigned long __cmpxchg(vo
(unsigned long)(new), \
sizeof(*(ptr))))

+#include <asm-generic/cmpxchg-local.h>
+
+static inline unsigned long __cmpxchg_local(volatile void *ptr,
+ unsigned long old,
+ unsigned long new, int size)
+{
+ switch (size) {
+ case 4:
+ return __cmpxchg_u32(ptr, old, new);
+ default:
+ return __cmpxchg_local_generic(ptr, old, new, size);
+ }
+
+ return old;
+}
+
+#define cmpxchg_local(ptr, old, new) \
+ ((typeof(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(old), \
+ (unsigned long)(new), \
+ sizeof(*(ptr))))
+
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
struct pt_regs;
void NORET_TYPE die(const char *str, struct pt_regs *regs, long err);
void _exception(long signr, struct pt_regs *regs, int code,