linux-kernel - Re: [Bug #13116] Can't boot with nosmp

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Message-Id: <200906100119.37479.rjw@sisk.pl>
Date:	Wed, 10 Jun 2009 01:19:36 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Avi Kivity <avi@...hat.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #13116] Can't boot with nosmp

On Tuesday 09 June 2009, Stephen Hemminger wrote:
> On Tue, 09 Jun 2009 21:42:55 +0300
> Avi Kivity <avi@...hat.com> wrote:
> 
> > Stephen Hemminger wrote:
> > 
> >   
> > 
> > >> This only affects reboots.  But yes, the cpumask code has bugs.  Does 
> > >> the .config involved select MAXSMP?
> > >>
> > >>     
> > >
> > > Patch does not fix the problem. Not sure if it is KVM only problem.
> > > Look like possible cpumask always equals what ACPI / SMP tables report.
> > > So currently looking into alloc_percpu which may not handle the possible
> > > but never used cpus.
> > >
> > >   
> > 
> > Right, it shouldn't have.
> > 
> > > It is x86-64 config and does not have MAXSMP set. It does have NR_CPUS set.
> > >   
> > 
> > So it's not cpumask.  Dare I suggest a bisect?
> > 
> 
> I did some testing of different versions.
> 
> * Problem does not exist with 2.6.30-rc8 (so regression should be closed).

Done.

Thanks,
Rafael
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