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

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Message-ID: <20080412095112.GB1597@elf.ucw.cz>
Date:	Sat, 12 Apr 2008 11:51:12 +0200
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jiri Kosina <jkosina@...e.cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Andi Kleen <andi@...stfloor.org>,
	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 Fri 2008-04-11 13:09:39, Ingo Molnar wrote:
> 
> * Pavel Machek <pavel@....cz> wrote:
> 
> > (I just want to fix the underlying problem in suspend, too. I guess
> > I'll just do something like
> 
> >  				if (drv->suspend) {
> > +					BUG_ON(!in_interrupt());
> >  					ret = drv->suspend(sysdev, state);
> 
> >  			pr_debug(" %s\n", kobject_name(&sysdev->kobj));
> >  
> > +			BUG_ON(!in_interrupt());
> >  			__sysdev_resume(sysdev);
> 
> small note: please always use WARN_ON_ONCE() in such cases. That way 
> people's boxes dont blow up and the problem will be debuggable if the 
> box survives despite the error condition. (and thus it can be relayed to 
> kerneloops.org - all major distros have the package included already and 
> Fedora enables the client by default)

Agreed, BUG_ON() was bad idea and I got the condition wrong.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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