From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 21 Oct 2013 05:57:41 +0000 (+0200)
Subject: s390/percpu: make use of interlocked-access facility 1 instructions
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~58^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f84cd97e5c61fe3ce66af838dd955dee02076639;p=pandora-kernel.git

s390/percpu: make use of interlocked-access facility 1 instructions

Optimize this_cpu_* functions for 64 bit by making use of new instructions
that came with the interlocked-access facility 1 (load-and-*) and the
general-instructions-extension facility (asi, agsi).
That way we get rid of the compare-and-swap loop in most cases.
Code size reduction (defconfig, -march=z196): 11,555 bytes.

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