x86: Clear incorrectly forced X86_FEATURE_LAHF_LM flag

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Due to an erratum with certain AMD Athlon 64 processors, the
BIOS may need to force enable the LAHF_LM capability.
Unfortunately, in at least one case, the BIOS does this even
for processors that do not support the functionality.

Add a specific check that will clear the feature bit for
processors known not to support the LAHF/SAHF instructions.

Signed-off-by: Kevin Winchester <kjwinchester@gmail.com>
Acked-by: Borislav Petkov <petkovbb@googlemail.com>
LKML-Reference: <4A80A5AD.2000209@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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Kevin Winchester 2009-08-10 19:56:45 -03:00 • committed by Ingo Molnar

parent 0d01f31439

commit fbd8b1819e

1 changed files with 7 additions and 0 deletions

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arch/x86/kernel/cpu/amd.c

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