[S390] atomic: implement atomic64_dec_if_positive
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Wed, 26 May 2010 21:26:18 +0000 (23:26 +0200)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Wed, 26 May 2010 21:26:29 +0000 (23:26 +0200)
Implement atomic64_dec_if_positive and add missing system.h header
include.

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

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