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[S390] atomic ops: add effecient atomic64 support for 31 bit
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Fri, 11 Sep 2009 08:28:34 +0000 (10:28 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Fri, 11 Sep 2009 08:29:43 +0000 (10:29 +0200)
Use compare double and swap to implement efficient atomic64 ops for 31 bit.

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

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