[patch 11/28] Add cmpxchg_local to frv

[Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>]

Use the new generic cmpxchg_local (disables interrupt) for 8, 16 and 64 bits
arguments. Use the 32 bits cmpxchg available on the architecture for 32 bits
arguments.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: clameter@sgi.com
---
 include/asm-frv/system.h |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

Index: linux-2.6-lttng/include/asm-frv/system.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-frv/system.h	2007-10-31 17:32:44.000000000 -0400
+++ linux-2.6-lttng/include/asm-frv/system.h	2007-10-31 18:03:56.000000000 -0400
@@ -265,5 +265,29 @@ extern uint32_t __cmpxchg_32(uint32_t *v
 
 #endif
 
+#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(ptr, old, new);
+	default:
+		return __cmpxchg_local_generic(ptr, old, new, size);
+	}
+
+	return old;
+}
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)				  	\
+	((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o),	\
+			(unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
 
 #endif /* _ASM_SYSTEM_H */

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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