Create asm-x86_64/cmpxchg.h

This is the x86_64 movement of cmpxchg into its own header. atomic.h already included system.h, so this is changed to include cmpxchg.h.

This is purely cleanup - it's not fixing any warnings - so if the x86_64 system.h isn't considered as cleanup-worthy as i386, then this can be dropped.

It causes no noticable damage to the x86_64 build.

--

 include/asm-x86_64/atomic.h  |    2 
 include/asm-x86_64/cmpxchg.h |  134 +++++++++++++++++++++++++++++++++++++++++++
 include/asm-x86_64/system.h  |  130 -----------------------------------------
 3 files changed, 136 insertions(+), 130 deletions(-)

Index: linux-2.6.21-mm/include/asm-x86_64/atomic.h
===================================================================
@@ -2,7 +2,7 @@
 #define __ARCH_X86_64_ATOMIC__
 
 #include <asm/alternative.h>
-#include <asm/system.h>
+#include <asm/cmpxchg.h>
 
 /* atomic_t should be 32 bit signed type */
 

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