From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 26 Jan 2009 03:30:41 +0000 (+0100)
Subject: x86: unmask CPUID levels on Intel CPUs, fix
X-Git-Tag: v2.6.29-rc3~42^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99fb4d349db7e7dacb2099c5cc320a9e2d31c1ef;p=pandora-kernel.git

x86: unmask CPUID levels on Intel CPUs, fix

Impact: fix boot hang on pre-model-15 Intel CPUs

rdmsrl_safe() does not work in very early bootup code yet, because we
dont have the pagefault handler installed yet so exception section
does not get parsed. rdmsr_safe() will just crash and hang the bootup.

So limit the MSR_IA32_MISC_ENABLE MSR read to those CPU types that
support it.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
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