Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9a7744f9823b9ddf14c47c475e81c1326b1a2787
Commit:     9a7744f9823b9ddf14c47c475e81c1326b1a2787
Parent:     b62f13439147210d5ad4bc40acee32b94c59f06d
Author:     Mathieu Desnoyers <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 7 00:16:26 2008 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 08:42:33 2008 -0800

    Add cmpxchg_local to xtensa
    
    Use the architecture specific __cmpxchg_u32 for 32 bits cmpxchg)_local. 
Else,
    use the new generic cmpxchg_local (disables interrupt).
    
    Signed-off-by: Mathieu Desnoyers <[EMAIL PROTECTED]>
    Cc: Chris Zankel <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 include/asm-xtensa/system.h |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/include/asm-xtensa/system.h b/include/asm-xtensa/system.h
index ddc9708..e0cb911 100644
--- a/include/asm-xtensa/system.h
+++ b/include/asm-xtensa/system.h
@@ -156,8 +156,30 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned 
long new, int size)
                                        (unsigned long)_n_, 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;
+}
+
+/*
+ * 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))
 
 /*
  * xchg_u32
-
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