linux-kernel - Re: 2.6.23-mm1

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Message-ID: <20071016195834.GA23157@linux.intel.com>
Date:	Tue, 16 Oct 2007 12:58:34 -0700
From:	Mark Gross <mgross@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: 2.6.23-mm1

On Mon, Oct 15, 2007 at 10:40:02PM +0200, Rafael J. Wysocki wrote:
> On Monday, 15 October 2007 18:09, Mark Gross wrote:
> > On Fri, Oct 12, 2007 at 11:32:40PM +0200, Rafael J. Wysocki wrote:
> > > On Friday, 12 October 2007 06:31, Andrew Morton wrote:
> > > > 
> > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23/2.6.23-mm1/
> > > > 
> > > > - I've been largely avoiding applying anything since rc8-mm2 in an attempt
> > > >   to stabilise things for the 2.6.23 merge.
> > > > 
> > > >   But that didn't stop all the subsystem maintainers from going nuts, with
> > > >   the usual accuracy.  We're up to a 37MB diff now, but it seems to be working
> > > >   a bit better.
> > > 
> > > I get many traces similar to the one below from it (w/ hotfixes):
> > > 
> > > WARNING: at /home/rafael/src/mm/linux-2.6.23-mm1/arch/x86_64/kernel/smp.c:397 smp_call_function_mask()
> > 
> > This is from : WARN_ON(irqs_disabled()) in the cmp_call_function_mask
> > processor_idle.c is registering a acpi_processor_latency_notify 
> > 
> > my code changed the notifier call from blocking_notifier_call_chain to
> > srcu_notifier_call_chain, because dynamic creation of notifier chains at
> > runtime where easier with the srcu_notifier_call_chain than the
> > blocking_notifier_call_chain.  
> > 
> > As dynamic creation of PM_QOS parameters are no longer needed I can
> > change the notifiers back to match what was in lanency.c
> > 
> > However; looking at the call tree differences between
> > blockin_notifier_call_chain and srcu_notifier_call_chain I cannot see a
> > difference in irq enabling / disabling.  I'm not confident this will
> > address this yet.
> 
> Well, you can send me a patch to check. :-)

I think I'll have to send you a patch that changes the notifiers but I
doubt it will fix it.  

After a bit of messing around I have the 2.6.23-mm1 running on my core-2
box  note: Ubuntu's make-kpkg on the mm1 tree resulted in a system that
wouldn't boot past the intrd.  Looks like the pivot root failed or
something.

Anyway, I'm not reproducing your experience, snd_pcm is loaded.  I don't
know none of the WARN's are not hitting on my box.

do you have some configuration information that could help me reproduce
the issue?

> 
> > I'll change the PM_QOS params patch to use blocking notifiers and test
> > on a 64bit boot and see what happens.  I've been needing to setup my
> > x86_64 dev box for a while now anyway.
> 
> OK, thanks.

well its booting but I'm not reproducing the trace messages.

I'll do the patch for you to test.

--mgross
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