[S390] xchg/cmpxchg: move to own header file
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Wed, 23 Mar 2011 09:16:05 +0000 (10:16 +0100)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Wed, 23 Mar 2011 09:15:59 +0000 (10:15 +0100)
Move xchg() and cmpxchg() functions to own header file like some
other architectures have done.
With this we make sure that system.h now really looks like a place
where everything is gathered that doesn't fit anywhere else.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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