linux-kernel - Re: 2.6.24-rc8-mm1: WARN_ON() in clockevents_register

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Date:	Sun, 20 Jan 2008 12:21:39 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc8-mm1: WARN_ON() in clockevents_register_device() on HP nx6325

On Sunday, 20 of January 2008, Ingo Molnar wrote:
> 
> * Rafael J. Wysocki <rjw@...k.pl> wrote:
> 
> > Something goes wrong in the timers land.  I get this on boot:
> > 
> > ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> > Disabling APIC timer
> > ------------[ cut here ]------------
> > WARNING: at /home/rafael/src/mm/linux-2.6.24-rc8-mm1/kernel/time/clockevents.c:1
> > 65 clockevents_register_device+0x36/0xc4()
> 
> ok, since we disable the APIC timer, i suspect this warning can be 
> disregarded - the bootup is otherwise fine, right?
> 
> Thomas - why do we register it while it's disabled? I have put in that 
> warning to detect APIC miscalibrations.

Well, for an unknown reason, there's a ~5 s delay during resume from RAM (in
fact I can also trigger it in the "core" test mode, ie. without entering the
sleep state), which I thought might be related.  If not, it might be necessary
to bisect again.  Sigh.

Thanks,
Rafael
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