linux-kernel - Re: [PATCH 00 of 11] x86: separate pmd lifetime from pgd

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Date:	Mon, 28 Jan 2008 07:39:01 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	LKML <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>,
	Jan Beulich <jbeulich@...ell.com>,
	Eduardo Pereira Habkost <ehabkost@...hat.com>,
	Ian Campbell <ijc@...lion.org.uk>,
	H Peter Anvin <hpa@...or.com>
Subject: Re: [PATCH 00 of 11] x86: separate pmd lifetime from pgd

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>
>   
>> This series addresses various cleanups in pagetable allocation in the 
>> direction of unifying 32/64 bits (that's still a while off yet).
>>     
>
> hm, i tried this, and got an early crash:
>
> [   29.389844] VFS: Mounted root (ext3 filesystem) readonly.
> [   29.389872] debug: unmapping init memory c0b03000..c0b6f000
> [   29.440139] PM: Adding info for No Bus:vcs1
> [   29.463676] khelper used greatest stack depth: 2404 bytes left
> [   29.467238] PM: Adding info for No Bus:vcsa1
> [   29.541785] PANIC: double fault, gdt at c1d16000 [255 bytes]
> [   29.541785] double fault, tss at c1d19100
> [   29.541785] eip = c011fa95, esp = c3bf6000
> [   29.541785] eax = c3bf6010, ebx = c0b6fc08, ecx = 0000007b, edx = 00000000
> [   29.541785] esi = f76a7df4, edi = c011fa90
>
> i think it's one of your patches :) Bisecting it down to the right one 
> now.

Wouldn't surprise me.  Given that its a non-PAE config, most of the 
patches won't be in play, but perhaps I screwed up coping the kernel 
pagetable entries into the pgd somehow.

    J
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