linux-kernel - Re: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes

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Message-ID: <20080117230607.GI12631@alberich.amd.com>
Date:	Fri, 18 Jan 2008 00:06:07 +0100
From:	"Andreas Herrmann3" <andreas.herrmann3@....com>
To:	"Ingo Molnar" <mingo@...e.hu>
cc:	"Venki Pallipadi" <venkatesh.pallipadi@...el.com>, ak@....de,
	ebiederm@...ssion.com, rdreier@...co.com,
	torvalds@...ux-foundation.org, gregkh@...e.de, airlied@...net.ie,
	davej@...hat.com, tglx@...utronix.de, hpa@...or.com,
	akpm@...ux-foundation.org, arjan@...radead.org,
	jesse.barnes@...el.com, davem@...emloft.net,
	linux-kernel@...r.kernel.org, suresh.b.siddha@...el.com
Subject: Re: [patch 0/4] x86: PAT followup - Incremental changes and bug
 fixes

On Thu, Jan 17, 2008 at 11:35:51PM +0100, Ingo Molnar wrote:
> 
> * Andreas Herrmann3 <andreas.herrmann3@....com> wrote:
> 
> > > I'll check this asap
> > 
> > So, now that I've avoided this tiny NULL-pointer-dereference, the 
> > system boots fine as well with your (slightly modified) patch. See 
> > dmesg attached.
> 
> for now i applied your ioremap_uncached() patch and removed my patch.
> 
> my patch might work if the MTRR marks that area UC. Does it on your 
> system?

The region (c0403000-c04031ff) is not characterized by an MTRR.
The MTRRdefType specifies it and it is

  MTRRdefType          = 0x0000000000000c00
    MemType=0
    MtrrDefTypeFixEn=0x1
    MtrrDefTypeEn=0x1

=> 0==UC

So, that's why it worked.


Andreas



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