linux-kernel - Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3 on IBM x3400

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Date:	Tue, 10 Feb 2009 00:45:28 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Morten P.D. Stevens" <mstevens@...-professional.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with
	2.6.29-rc3 on IBM x3400


* Morten P.D. Stevens <mstevens@...-professional.com> wrote:

> Hi,
> 
> Update:
> 
> the same issue with a linux 2.6.28.4 kernel.
> 
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/generic.c:404 generic_get_mtrr+0xdf/0x119()
> [    0.000000] mtrr: your BIOS has set up an incorrect mask, fixing it up.

buggy BIOS most likely. Had the kernel not fixed up the MTRRs you'd have
a very slow and unhappy system now.

	Ingo
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