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s390/cmpxchg: add missing memory barrier to cmpxchg64
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Tue, 29 May 2012 04:54:32 +0000 (06:54 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Wed, 30 May 2012 07:07:55 +0000 (09:07 +0200)
All cmpxchg functions imply a memory barrier.
cmpxch64 did not have one for 31 bit code, so add it.

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

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