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

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Message-ID: <20080118173337.GC12009@balbir.in.ibm.com>
Date:	Fri, 18 Jan 2008 23:03:37 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	Andreas Herrmann3 <andreas.herrmann3@....com>,
	Ingo Molnar <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...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,
	"Barnes, Jesse" <jesse.barnes@...el.com>, davem@...emloft.net,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 0/4] x86: PAT followup - Incremental changes and bug
	fixes

* Pallipadi, Venkatesh <venkatesh.pallipadi@...el.com> [2008-01-18 09:13:10]:

> 
> 
> >-----Original Message-----
> >From: Andreas Herrmann3 [mailto:andreas.herrmann3@....com] 
> >Sent: Friday, January 18, 2008 8:11 AM
> >To: Pallipadi, Venkatesh
> >Cc: Ingo Molnar; Siddha, Suresh B; 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; 
> >Barnes, Jesse; davem@...emloft.net; linux-kernel@...r.kernel.org
> >Subject: Re: [patch 0/4] x86: PAT followup - Incremental 
> >changes and bug fixes
> >
> >On Thu, Jan 17, 2008 at 03:04:10PM -0800, Venki Pallipadi wrote:
> >>
> >> Below is another potential fix for the problem here. Going 
> >through ACPI
> >> ioremap usages, we found at one place the mapping is cached 
> >for possible
> >> optimization reason and not unmapped later. Patch below always unmaps
> >> ioremap at this place in ACPICA.
> >
> >The patch does not fix the problem. The conflicting cache 
> >attributes are
> >still there.
> >
> 
> Andreas,
> 
> Could you also try the patch Suresh Siddha sent out yesterday. That
> covers the case where the attribute was not getting removed even after
> unmap was called.
>

An easy way for you to figure out if our patch will solve your problem
is this, look for any quirks for your device in drivers/pci/quirks.c
and or architecture specific quirks file. If you see your device in
there, then our patch is likely to solve your problem.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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