linux-kernel - Re: unify pagetable accessors patch causes double fault II

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Message-ID: <478BBD79.1080007@goop.org>
Date:	Mon, 14 Jan 2008 11:52:25 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andi Kleen <andi@...stfloor.org>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: unify pagetable accessors patch causes double fault II

Ingo Molnar wrote:
> would be nice to have some debugging apparatus for bugs like this. 
> Perhaps artificially add a large pfn, then convert/unconvert, then 
> subtract it and expect the whole transformation to be an identity 
> mapping? This way we could simulate most of the effects of >4GB RAM, 
> right?

Yeah, good idea.  I'll code something up to run at pagetable init time 
or something.

    J

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