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x86, fpu: enable eagerfpu by default for xsaveopt

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xsaveopt/xrstor support optimized state save/restore by tracking the
INIT state and MODIFIED state during context-switch.

Enable eagerfpu by default for processors supporting xsaveopt.
Can be disabled by passing "eagerfpu=off" boot parameter.

Signed-off-by: Suresh Siddha <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Suresh Siddha 2012-09-06 15:05:18 -07:00 • committed by H. Peter Anvin
commit 212b02125f
3 changed files with 5 additions and 1 deletions
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2
Documentation/kernel-parameters.txt
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@ -1834,7 +1834,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
enabling legacy floating-point and sse state.
eagerfpu= [X86]
on enable eager fpu restore
on enable eager fpu restore (default for xsaveopt)
off disable eager fpu restore
nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or