linux-kernel - Re: Make the 32 bit Frame Pointer backtracer fall back to traditional

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Message-ID: <20080110124606.GD15156@elte.hu>
Date:	Thu, 10 Jan 2008 13:46:06 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Make the 32 bit Frame Pointer backtracer fall back to
	traditional


* Harvey Harrison <harvey.harrison@...il.com> wrote:

> On Wed, 2008-01-09 at 22:05 -0800, Arjan van de Ven wrote:
> > Subject: Make the 32 bit Frame Pointer backtracer fall back to traditional
> > From: Arjan van de Ven <arjan@...ux.intel.com>
> > 
> > The 32 bit Frame Pointer backtracer code checks if the EBP is valid
> > to do a backtrace; however currently on a failure it just gives up
> > and prints nothing. That's not very nice; we can do better and still
> > print a decent backtrace. 
> > 
> > This patch changes the backtracer to fall back to the non-framepointer
> > backtracer if the EBP value isn't within the expected range; so on weird
> > stack corruption cases we get at least something out...
> > 
> 
> Arjan, I've been doing some work on traps_32.c porting over the 
> oops_begin()/oops_end()/_die() arrangement from traps_64.c and then 
> use it in unifying some more parts of fault.c.

i've got that applied and it did not seem to interact with Arjan's code.

> If you have other work in this area, I'll hold off until your stuff 
> goes in...feel free to send me any work in progress stuff and I can 
> try to coordinate with you.

i'll yell if anything clashes.

	Ingo
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