From: Suresh Siddha <suresh.b.siddha@intel.com>
Date: Mon, 19 Jul 2010 23:05:52 +0000 (-0700)
Subject: x86, xsave: Use xsaveopt in context-switch path when supported
X-Git-Tag: v2.6.36-rc1~507^2~9
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6bad06b768920e278c7cedfdda56a0b4c6a35ee9;p=pandora-kernel.git

x86, xsave: Use xsaveopt in context-switch path when supported

xsaveopt is a more optimized form of xsave specifically designed
for the context switch usage. xsaveopt doesn't save the state that's not
modified from the prior xrstor. And if a specific feature state gets
modified to the init state, then xsaveopt just updates the header bit
in the xsave memory layout without updating the corresponding memory
layout.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <20100719230205.604014179@sbs-t61.sc.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

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