linux-kernel - Re: BUG: using smp_processor_id() in preemptible [00000000] code: pm-suspend/17334

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Date:	Wed, 4 Jun 2008 13:13:13 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, avi@...ranet.com
Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code:
 pm-suspend/17334

On Wed, 4 Jun 2008, Thomas Gleixner wrote:

> > OK, so it looks like KVM could be wrongly enabling IRQs/preemption on 
> > the resume path. The original bug-report is on 
> > http://lkml.org/lkml/2008/4/7/130
> sysdev_resume() is supposed to run with interrupts disabled, at least
> it was that way when the timekeeping_resume code was written.

True. However in Zdenek's case, interrupts/preemption gets enabled 
somewhere during the resume, which correctly triggers the warning.

Thanks,

-- 
Jiri Kosina
SUSE Labs
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