linux-kernel - Re: [RFC] use realmode code to reserve end-of-conventional-memory to 1MB

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Date:	Tue, 4 Mar 2008 17:23:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mark McLoughlin <markmc@...hat.com>
Cc:	Ian Campbell <ijc@...lion.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	Alexander van Heukelum <heukelum@...lshack.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Andi Kleen <ak@...e.de>, Thomas Gleixner <tglx@...utronix.de>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] use realmode code to reserve end-of-conventional-memory
	to 1MB


* Mark McLoughlin <markmc@...hat.com> wrote:

> > i'm wondering, what triggered this bug, and why didnt we have these 
> > problems in the past?
> 
> That's been bothering me too, but hadn't come up with anything until I 
> just now looked again.
> 
> I'm pretty certain that dmi_scan_machine() wasn't using a fixmap 
> before (in 2.6.24) since I had to fix a broken xen dom0 patch to 
> handle this new situation.

ah, ok, indeed Jeremy's gut feeling about early_ioremap() was right - we 
didnt use fixmaps for early_ioremap() [ ex. bt_ioremap() ] in .24. We 
try to slowly get rid of the linearity assumptions from arch/x86, this 
was one of the steps.

	Ingo
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