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From: Ingo Molnar <mingo@elte.hu>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Andi Kleen <andi@firstfloor.org>,
	tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: unify pagetable accessors patch causes double fault II
Date: Mon, 14 Jan 2008 17:56:35 +0100	[thread overview]
Message-ID: <20080114165635.GK15542@elte.hu> (raw)
In-Reply-To: <478B9183.3020101@goop.org>


* Jeremy Fitzhardinge <jeremy@goop.org> wrote:

>> This is with PAE and seems to only happen with enough RAM (6GB); a 
>> 2GB system boots. 64bit also works.
>
> Thanks, I'll have a close look at it.  Presumably a pfn is getting 
> truncated to 20/32-bits somewhere.

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?

	Ingo

  reply	other threads:[~2008-01-14 16:57 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20080114094814.GA28300@basil.nowhere.org>
2008-01-14 12:56 ` Andi Kleen
2008-01-14 13:06   ` Ingo Molnar
2008-01-14 13:58     ` Andi Kleen
2008-01-14 16:44       ` Jeremy Fitzhardinge
2008-01-14 16:56         ` Ingo Molnar [this message]
2008-01-14 17:08           ` Andi Kleen
2008-01-14 17:18             ` unify pagetable accessors patch causes double fault III Andi Kleen
2008-01-14 19:00               ` Ingo Molnar
2008-01-14 19:54                 ` Jeremy Fitzhardinge
2008-01-14 20:15                 ` Andi Kleen
2008-01-14 19:52           ` unify pagetable accessors patch causes double fault II Jeremy Fitzhardinge
2008-01-14 22:03       ` Jeremy Fitzhardinge
2008-01-14 22:23         ` Andi Kleen
2008-01-14 22:46           ` Jeremy Fitzhardinge
2008-01-15  1:05             ` Andi Kleen
2008-01-15  1:32               ` Jeremy Fitzhardinge
2008-01-15  1:38                 ` Andi Kleen
2008-01-15 21:03                   ` [patch] x86: lfence fix Ingo Molnar
2008-01-16  0:44                     ` Andi Kleen
2008-01-15 12:55               ` unify pagetable accessors patch causes double fault II Ingo Molnar
2008-01-15 16:53                 ` Andi Kleen
2008-01-15 13:53             ` Ingo Molnar
2008-01-15 17:16               ` Folding _PAGE_PWT into _PAGE_PCD (was Re: unify pagetable accessors patch causes double fault II) Jeremy Fitzhardinge
2008-01-15 17:23                 ` Andi Kleen
2008-01-15 17:32                   ` Jeremy Fitzhardinge
2008-01-15 17:39                     ` Andi Kleen
2008-01-15 20:30                 ` Venki Pallipadi
2008-01-15 20:45                   ` Jeremy Fitzhardinge
2008-01-15 17:36               ` unify pagetable accessors patch causes double fault II Andi Kleen
2008-01-15 19:43                 ` Jeremy Fitzhardinge

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