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x86, fpu: make eagerfpu= boot param tri-state

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Add the "eagerfpu=auto" (that selects the default scheme in
enabling eagerfpu) which can override compiled-in boot parameters
like "eagerfpu=on/off" (that force enable/disable eagerfpu).

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 2012-09-10 10:32:32 -07:00 • committed by H. Peter Anvin
commit e00229819f
2 changed files with 15 additions and 6 deletions
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4
Documentation/kernel-parameters.txt
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@ -1834,8 +1834,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
enabling legacy floating-point and sse state.
eagerfpu= [X86]
on enable eager fpu restore (default for xsaveopt)
on enable eager fpu restore
off disable eager fpu restore
auto selects the default scheme, which automatically
enables eagerfpu restore for xsaveopt.
nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or
wfi(ARM) instruction doesn't work correctly and not to