From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 17 Sep 2012 04:38:22 +0000 (+0200)
Subject: s390/percpu: implement this_cpu_xchg()
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~81^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=28634a07d3f72f2c186ad465e58f72e728c5cd4e;p=pandora-kernel.git

s390/percpu: implement this_cpu_xchg()

The generic variant has a local_irq_save/restore pair which is quite
expensive. It is sufficient to disable preemption, which is a no-op
with !CONFIG_PREEMPT and then use the regular xchg macro.

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