From: Kevin Winchester <kjwinchester@gmail.com>
Date: Mon, 10 Aug 2009 22:56:45 +0000 (-0300)
Subject: x86: Clear incorrectly forced X86_FEATURE_LAHF_LM flag
X-Git-Tag: v2.6.31-rc6~4^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fbd8b1819e80ac5a176d085fdddc3a34d1499318;p=pandora-kernel.git

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>
---

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