From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 11 Sep 2013 12:28:47 +0000 (+0200)
Subject: s390/atomic: implement atomic_sub_return() with atomic_add_return()
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~58^2~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86d51bc31fabd3782a99375b6848c5c667e72605;p=pandora-kernel.git

s390/atomic: implement atomic_sub_return() with atomic_add_return()

Get rid of the own atomic_sub_return() implementation. Otherwise we can't
make use of the interlocked-access facility 1 instructions for
atomic_sub_return(), since there is no "load and subtract" instruction
available.

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