linux-kernel - Re: 2.6.21-rc[123] regression with NOAPIC

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Date:	Thu, 22 Mar 2007 15:16:30 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ray Lee <ray-lk@...rabbit.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	john stultz <johnstul@...ibm.com>,
	Len Brown <len.brown@...el.com>, Andi Kleen <ak@...e.de>,
	linux-acpi@...r.kernel.org
Subject: Re: 2.6.21-rc[123] regression with NOAPIC

On Thu, Mar 22, 2007 at 03:10:03PM +0100, Thomas Gleixner wrote:
> On Thu, 2007-03-22 at 14:42 +0100, Adrian Bunk wrote:
> > > Starting with head as of yesterday and reverting two commits (that are
> > > duplicates of each other -- the same commit came into Linus's tree via
> > > two different paths) 'fixes' the problem for me. I'll let those with the
> > > big brains decide just why.
> > > 
> > > The two commits are 5c95d3f5783ab184f64b7848f0a871352c35c3cf and
> > > 3434933b17fa64adddf83059603c61296f6e1ee2 . The net reverse diff of those
> > > two is below.
> > >...
> > 
> > Thanks for tracking it down.
> > 
> > It's quite possible that these commits trigger your problem.
> > 
> > Does it work if you do _not_ revert the commits, and instead replace in
> > drivers/acpi/processor_idle.c the
> >   #ifdef ARCH_APICTIMER_STOPS_ON_C3
> > with an
> >   #if 0
> > ?
> 
> Then NOAPIC probably works again, but booting w/o NOAPIC fails.

But we'll know that it's this code that has a problen with noapic
in the CONFIG_GENERIC_CLOCKEVENTS=n case.

> 	tglx

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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