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

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Date:	Mon, 28 Jan 2008 08:20:48 -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:
> and after a session of bisection, the winner patch is:
>
>   Subject: x86: unify PAE/non-PAE pgd_ctor
>
> which is a tad unexpected, given the relatively harmless nature of the 
> patch. (but then again, nothing is really harmless in PAE land.)
>   

Oh, well, good.  At least off-the-cuff diagnosis was right.  I must have 
overlooked some detail in that merge.

> btw., this is not fair i think: your patch was apparently caught by the 
> new debugging helper that tells about itself here:
>
>   
>> [   29.389872] debug: unmapping init memory c0b03000..c0b6f000
>>     
>
> note the close proximity of c0b6f000 and ebx = c0b6fc08. [ I regularly 
> come up with such nasty tricks and debugging helpers like that to catch 
> bad patches off-guard. You have been warned! ;-) ]
>   

Hm, perhaps, but it could be as easily coincidence.  The place there 
initmem is freed is close to where it first needs to rely on a 
non-initmm pagetable.  I presume that message means that c0b6f000 was 
*not* freed.

    J
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