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

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Date:	Thu, 17 Jan 2008 15:33:45 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andreas Herrmann3 <andreas.herrmann3@....com>,
	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, 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

Ingo Molnar wrote:
> * Andreas Herrmann3 <andreas.herrmann3@....com> wrote:
> 
>> For the failed devices I get:
>>
>>   sata_sil 0000:00:12.0: version 2.3
>>   ACPI: PCI Interrupt 0000:00:12.0[A] -> GSI 22 (level, low) -> IRQ 22
>>   ioremap_nocache: addr c0403000, size 200
>>   swapper:1 conflicting cache attribute c0403000-c0404000 uncached<->default
>>   ACPI: PCI interrupt for device 0000:00:12.0 disabled
> 
> hm, is the problem that the two devices share the same physical page, 
> and thus get an overlapping area?
> 
> as an intermediate fix, how about following the attribute of the already 
> existing mapping, instead of rejecting the ioremap due to the conflict? 
> I.e. something like below?

The correct behaviour probably would be to go with the most restrictive 
caching behaviour, i.e. uncached in this case.

	-hpa
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