linux-kernel - Re: [bisected] 2.6.31 regression: fails to boot as xen guest

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Message-Id: <1251224072.13451.10.camel@penberg-laptop>
Date:	Tue, 25 Aug 2009 21:14:32 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Arnd Hannemann <hannemann@...s.rwth-aachen.de>,
	Arnd Hannemann <Arnd.Hannemann@...s.rwth-aachen.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [bisected] 2.6.31 regression: fails to boot as xen guest

On Tue, 2009-08-25 at 11:06 -0700, Jeremy Fitzhardinge wrote:
> On 08/25/09 09:52, Pekka Enberg wrote:
> > Hi Arnd,
> >
> > On Tue, 2009-08-25 at 18:49 +0200, Arnd Hannemann wrote:
> >   
> >>> Thanks for doing the bisect! Can we also see your .config also?
> >>>       
> >> Config for -rc7 is attached. My bisect configs were based on that
> >>     
> > Thanks! While we wait for the Xen people, you can try the following
> > patch to see if we can narrow the bug down to trap_init().
> >   
> 
> I think there's a problem that the side-effect of this change is that
> interrupt initialization comes later, and so the dynamically allocated
> arrays are not set up when the first interrupt comes in.

Which interrupt initialization is that? We call trap_init() _earlier_
now.

> However, this particular change shouldn't have any effect on interrupts
> being enabled early, right?

Yeah, interrupt enabling should not be affected.

			Pekka

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