linux-kernel - Re: [BUG] 3.2-rcX regression: boot failure on AMD K6-III/450

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Message-ID: <20111128144738.GA3119@gherkin.frus.com>
Date:	Mon, 28 Nov 2011 08:47:38 -0600
From:	Bob Tracy <rct@...rkin.frus.com>
To:	Borislav Petkov <bp@...64.org>, linux-kernel@...r.kernel.org
Subject: Re: [BUG] 3.2-rcX regression: boot failure on AMD K6-III/450

On Mon, Nov 28, 2011 at 03:01:43PM +0100, Borislav Petkov wrote:
> can you try the following patch:
> (...)
> bcb80e53877c ("x86, microcode, AMD: Add microcode revision to
> /proc/cpuinfo") added support for dumping microcode patch level in
> /proc/cpuinfo on AMD. Although we were very cautious and did rdmsr_safe
> the microcode patch level MSR, this broke booting on Geode LX because
> this CPU doesn't have that MSR and at the time we do the read, exception
> tables which are used by rdmsr_safe are not yet initialized, leading to
> the boot hang.
> 
> This is the simple fix which enables the microcode line in /proc/cpuinfo
> for K8 and newer (it is not that interesting for older boxes anyway :-)).
> 
> Reported-and-bisected-and-tested-by: Daniel Drake <dsd@...top.org>
> Link: http://lkml.kernel.org/r/CAMLZHHTSuHZoPbm_YfB8G05JA+xKCE4+Jmj4NW8mnZUHogQSBA@mail.gmail.com
> Signed-off-by: Borislav Petkov <borislav.petkov@....com>

That fixed it.  Thank you!

--Bob
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