linux-kernel - Re: [BUG] /proc/mtrr I/O error

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Message-ID: <86802c440809021608s54725294t5629255bb1f0c9@mail.gmail.com>
Date:	Tue, 2 Sep 2008 16:08:00 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Bob Tracy" <rct@...rkin.frus.com>, linux-kernel@...r.kernel.org
Subject: Re: [BUG] /proc/mtrr I/O error

On Tue, Sep 2, 2008 at 3:46 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Fri, 29 Aug 2008 16:38:24 -0500
> Bob Tracy <rct@...rkin.frus.com> wrote:
>
>> With 2.6.27-rc4 and possibly earlier kernels, I see the following:
>>
>> $ cat /proc/mtrr
>> cat: /proc/mtrr: Input/output error
>>
>> Processor is an AMD K6-III/450.
>>
>
> static int mtrr_open(struct inode *inode, struct file *file)
> {
>        if (!mtrr_if)
>                return -EIO;
>
>
>
> Beats me.  Perhaps something broke in mtrr_bp_init().
>
> It would be useful to know if 2.6.26 worked OK.
>

two patches needed..

http://lkml.org/lkml/2008/9/1/307
   [PATCH 4/6] x86: delay early cpu initialization until cpuid is done
http://lkml.org/lkml/2008/9/1/308
  [PATCH 5/6] x86: move mtrr cpu cap setting early in early_init_xxxx

YH
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