linux-kernel - Re: [RFC Patch] use MTRR for write combining if PAT is not available

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Date:	Wed, 21 Oct 2009 13:52:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Thomas Schlichter <thomas.schlichter@....de>,
	Jan Beulich <JBeulich@...ell.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"dri-devel@...ts.sourceforge.net" <dri-devel@...ts.sourceforge.net>,
	"hancockrwd@...il.com" <hancockrwd@...il.com>,
	"hmh@....eng.br" <hmh@....eng.br>, "hpa@...or.com" <hpa@...or.com>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"jeremy.fitzhardinge@...rix.com" <jeremy.fitzhardinge@...rix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"thellstrom@...are.com" <thellstrom@...are.com>,
	"tj@...nel.org" <tj@...nel.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"yinghai@...nel.org" <yinghai@...nel.org>
Subject: Re: [RFC Patch] use MTRR for write combining if PAT is not
	available


* Suresh Siddha <suresh.b.siddha@...el.com> wrote:

> On Tue, 2009-10-20 at 13:35 -0700, Thomas Schlichter wrote:
> > What do you think about the latest version of my patch series I just sent?
> 
> I think we can simplify this by just using mtrr_add_page() and avoid 
> all the complexity that comes with mtrr_add_unaligned().
> 
> pci_mmap_range() should call one mtrr_add_page() if the base and size 
> are nicely aligned. Almost all the cases, this is the usage sequence 
> here anyway.

yep, keeping it simple is a must.

	Ingo
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