tree 7b2d450a6f64808ccf5bc6f8049a877c8db86ff0
parent 0d01f31439c1e4d602bf9fdc924ab66f407f5e38
author Kevin Winchester <kjwinchester@gmail.com> 1249945005 -0300
committer Ingo Molnar <mingo@elte.hu> 1249990494 +0200

x86: Clear incorrectly forced X86_FEATURE_LAHF_LM flag

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>