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

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Date:	Tue, 20 Oct 2009 14:59:23 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Thomas Schlichter <thomas.schlichter@....de>
Cc:	Ingo Molnar <mingo@...e.hu>, 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

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.

thanks,
suresh

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