From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Mon, 22 Sep 2014 14:34:38 +0000 (+0200)
Subject: s390/rwlock: use the interlocked-access facility 1 instructions
X-Git-Tag: fixes-against-v3.18-rc2~83^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bbae71bf9c2fe90dc5642d4cddbbc1994861fd92;p=pandora-kernel.git

s390/rwlock: use the interlocked-access facility 1 instructions

Make use of the load-and-add, load-and-or and load-and-and instructions
to atomically update the read-write lock without a compare-and-swap loop.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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