linux-kernel - Re: BUG: using smp_processor_id() during suspend with 2.6.25-rc8

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Message-Id: <200804111727.33922.rjw@sisk.pl>
Date:	Fri, 11 Apr 2008 17:27:32 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Pavel Machek <pavel@....cz>,
	Jiri Kosina <jkosina@...e.cz>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: BUG: using smp_processor_id() during suspend with 2.6.25-rc8

On Friday, 11 of April 2008, Andi Kleen wrote:
> > thanks Pavel, i picked this up into sched-devel.git - it makes sense 
> > independently of whether it solves the warning.
> 
> This means the CPU preempt sanity checking is effectively disabled
> on UP kernels. Even though more and more people should run multi-core
> now there is still a sizeable user base left on single core.
> 
> Don't think this is a good idea. We need even the UP testers.

Agreed.

Besides, I'd like to learn what caused the problem to appear in the first
place.

> If he wants this for suspend or machine check/oops (always useful there
> to disable such warnings) then there should
> be separate checks for this. Perhaps system_state could be enhanced for this?

That would make sense.

Thanks,
Rafael
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