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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-02-07 00:16:24 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-07 08:42:32 -0800
commitfe4130131ef9e55763fd634a02b1db9290dbbe5a (patch)
tree523a97bd9f3b9302edfb80c5175ec9a528c1b807 /include/asm-s390/system.h
parent85fdbe1b4b33b797321bfadf706b355e7cca6165 (diff)
Add cmpxchg_local to s390
Use the standard __cmpxchg for every type that can be updated atomically. Use the new generic cmpxchg_local (disables interrupt) for other types. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-s390/system.h')
-rw-r--r--include/asm-s390/system.h44
1 files changed, 41 insertions, 3 deletions
diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h
index 44bda786eef7..15aba30601a3 100644
--- a/include/asm-s390/system.h
+++ b/include/asm-s390/system.h
@@ -201,9 +201,9 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
#define __HAVE_ARCH_CMPXCHG 1
-#define cmpxchg(ptr,o,n)\
- ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
- (unsigned long)(n),sizeof(*(ptr))))
+#define cmpxchg(ptr, o, n) \
+ ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
+ (unsigned long)(n), sizeof(*(ptr))))
extern void __cmpxchg_called_with_bad_pointer(void);
@@ -355,6 +355,44 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
#include <linux/irqflags.h>
+#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 1:
+ case 2:
+ case 4:
+#ifdef __s390x__
+ case 8:
+#endif
+ return __cmpxchg(ptr, old, new, size);
+ 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))))
+#ifdef __s390x__
+#define cmpxchg64_local(ptr, o, n) \
+ ({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ cmpxchg_local((ptr), (o), (n)); \
+ })
+#else
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+#endif
+
/*
* Use to set psw mask except for the first byte which
* won't be changed by this function.