From: Andreas Herrmann <andreas.herrmann3@amd.com>
Date: Fri, 19 Mar 2010 11:09:22 +0000 (+0100)
Subject: x86, amd: Restrict usage of c1e_idle()
X-Git-Tag: v2.6.34-rc3~21^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=035a02c1e1de31888e8b6adac0ff667971ac04db;p=pandora-kernel.git

x86, amd: Restrict usage of c1e_idle()

Currently c1e_idle returns true for all CPUs greater than or equal to
family 0xf model 0x40. This covers too many CPUs.

Meanwhile a respective erratum for the underlying problem was filed
(#400). This patch adds the logic to check whether erratum #400
applies to a given CPU.
Especially for CPUs where SMI/HW triggered C1e is not supported,
c1e_idle() doesn't need to be used. We can check this by looking at
the respective OSVW bit for erratum #400.

Cc: <stable@kernel.org> # .32.x .33.x
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
LKML-Reference: <20100319110922.GA19614@alberich.amd.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---

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