From: Jan Beulich <JBeulich@suse.com>
Date: Fri, 24 Feb 2012 11:55:01 +0000 (+0000)
Subject: x86-64: Improve insn scheduling in SAVE_ARGS_IRQ
X-Git-Tag: v3.4-rc1~157^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=69466466ce889cd2cbc8cda9ff1c6083f48cc7f9;p=pandora-kernel.git

x86-64: Improve insn scheduling in SAVE_ARGS_IRQ

In one case, use an address register that was computed earlier (and
with a simpler instruction), thus reducing the risk of a stall.

In the second case, eliminate a branch by using a conditional move (as
is already done in call_softirq and xen_do_hypervisor_callback).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/4F4788A50200007800074A26@nat28.tlf.novell.com
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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