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

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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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Suresh Siddha 2010-07-19 16:05:52 -07:00 • committed by H. Peter Anvin

parent 29104e101d

commit 6bad06b768

3 changed files with 15 additions and 4 deletions

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2

arch/x86/include/asm/i387.h

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9

arch/x86/include/asm/xsave.h

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8

arch/x86/kernel/cpu/common.c

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