linux-kernel - Re: [PATCH] ACPI: use ioremap

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Message-ID: <4D1A449F.50002@zytor.com>
Date:	Tue, 28 Dec 2010 12:12:15 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	Len Brown <lenb@...nel.org>, Jack Steiner <steiner@....com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	"tony.luck@...il.com" <tony.luck@...il.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gbeshers@....com" <gbeshers@....com>
Subject: Re: [PATCH] ACPI: use ioremap_cache()

On 12/27/2010 09:02 PM, Shaohua Li wrote:
>>
>> For x86, that is handled by the MTRRs; 
> does it cause any problem if the pat and mtrr doesn't match?
> 

No, the interaction rules between PAT and MTRR are well-defined; see the
SDM 3A.  If they weren't we would have huge problems with SMM.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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