linux-kernel - Re: [PATCH 1/4] x86, gart: Don't enforce GART aperture lower-bound by alignment

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Message-ID: <4DAC7739.2060100@zytor.com>
Date:	Mon, 18 Apr 2011 10:39:05 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Joerg Roedel <joro@...tes.org>
CC:	"Roedel, Joerg" <Joerg.Roedel@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 1/4] x86, gart: Don't enforce GART aperture lower-bound
 by alignment

On 04/18/2011 10:36 AM, Joerg Roedel wrote:
>>
>> The right thing to do for in-place kexec it to turn it off, not rely on
>> any specific magic addresses.  We have had this problem with a number of
>> drivers in the context of kexec.
> 
> Ok, so changing the start-address to zero seems the best thing to do.
> This way the GART will working again on machines with less than 512MB of
> RAM (and a BIOS that does not initialize the GART as we want it).
> 

I'm going to apply your patch as-is, based on the notion that this is a
change of mechanism, and a change of policy is a separate thing.
However, we should address the shutdown of the GART first, and then we
can move the start address to zero (again, two separate patches.)

	-hpa
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