Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=405321d3ab2b41960e2874f2f74609daffbc7a4c
Commit:     405321d3ab2b41960e2874f2f74609daffbc7a4c
Parent:     fe4130131ef9e55763fd634a02b1db9290dbbe5a
Author:     Mathieu Desnoyers <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 7 00:16:24 2008 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 08:42:32 2008 -0800

    Add cmpxchg_local to sparc, move __cmpxchg to system.h
    
    Move cmpxchg and add cmpxchg_local to system.h.
    Use the new generic cmpxchg_local (disables interrupt).
    
    Signed-off-by: Mathieu Desnoyers <[EMAIL PROTECTED]>
    Cc: William Lee Irwin III <[EMAIL PROTECTED]>
    Cc: "David S. Miller" <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 include/asm-sparc/atomic.h |   36 ---------------------------------
 include/asm-sparc/system.h |   48 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 36 deletions(-)

diff --git a/include/asm-sparc/atomic.h b/include/asm-sparc/atomic.h
index 3328950..5c944b5 100644
--- a/include/asm-sparc/atomic.h
+++ b/include/asm-sparc/atomic.h
@@ -17,42 +17,6 @@ typedef struct { volatile int counter; } atomic_t;
 
 #ifdef __KERNEL__
 
-/* Emulate cmpxchg() the same way we emulate atomics,
- * by hashing the object address and indexing into an array
- * of spinlocks to get a bit of performance...
- *
- * See arch/sparc/lib/atomic32.c for implementation.
- *
- * Cribbed from <asm-parisc/atomic.h>
- */
-#define __HAVE_ARCH_CMPXCHG    1
-
-/* bug catcher for when unsupported size is used - won't link */
-extern void __cmpxchg_called_with_bad_pointer(void);
-/* we only need to support cmpxchg of a u32 on sparc */
-extern unsigned long __cmpxchg_u32(volatile u32 *m, u32 old, u32 new_);
-
-/* don't worry...optimizer will get rid of most of this */
-static inline unsigned long
-__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
-{
-       switch(size) {
-       case 4:
-               return __cmpxchg_u32((u32 *)ptr, (u32)old, (u32)new_);
-       default:
-               __cmpxchg_called_with_bad_pointer();
-               break;
-       }
-       return old;
-}
-
-#define cmpxchg(ptr,o,n) ({                                            \
-       __typeof__(*(ptr)) _o_ = (o);                                   \
-       __typeof__(*(ptr)) _n_ = (n);                                   \
-       (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,       \
-                       (unsigned long)_n_, sizeof(*(ptr)));            \
-})
-
 #define ATOMIC_INIT(i)  { (i) }
 
 extern int __atomic_add_return(int, atomic_t *);
diff --git a/include/asm-sparc/system.h b/include/asm-sparc/system.h
index 2655d14..45e47c1 100644
--- a/include/asm-sparc/system.h
+++ b/include/asm-sparc/system.h
@@ -225,6 +225,54 @@ static inline unsigned long __xchg(unsigned long x, 
__volatile__ void * ptr, int
        return x;
 }
 
+/* Emulate cmpxchg() the same way we emulate atomics,
+ * by hashing the object address and indexing into an array
+ * of spinlocks to get a bit of performance...
+ *
+ * See arch/sparc/lib/atomic32.c for implementation.
+ *
+ * Cribbed from <asm-parisc/atomic.h>
+ */
+#define __HAVE_ARCH_CMPXCHG    1
+
+/* bug catcher for when unsupported size is used - won't link */
+extern void __cmpxchg_called_with_bad_pointer(void);
+/* we only need to support cmpxchg of a u32 on sparc */
+extern unsigned long __cmpxchg_u32(volatile u32 *m, u32 old, u32 new_);
+
+/* don't worry...optimizer will get rid of most of this */
+static inline unsigned long
+__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
+{
+       switch (size) {
+       case 4:
+               return __cmpxchg_u32((u32 *)ptr, (u32)old, (u32)new_);
+       default:
+               __cmpxchg_called_with_bad_pointer();
+               break;
+       }
+       return old;
+}
+
+#define cmpxchg(ptr, o, n)                                             \
+({                                                                     \
+       __typeof__(*(ptr)) _o_ = (o);                                   \
+       __typeof__(*(ptr)) _n_ = (n);                                   \
+       (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,       \
+                       (unsigned long)_n_, sizeof(*(ptr)));            \
+})
+
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)                                              \
+       ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+                       (unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
 extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ 
((noreturn));
 
 #endif /* __KERNEL__ */
-
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