linux-kernel - Re: Help needed: Resume problems in 2.6.32-rc, perhaps related to preempt

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Date:	Mon, 9 Nov 2009 16:47:03 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mike Galbraith <efault@....de>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: Help needed: Resume problems in 2.6.32-rc, perhaps related to preempt_count leakage in keventd

On Monday 09 November 2009, Mike Galbraith wrote:
> On Mon, 2009-11-09 at 15:26 +0100, Rafael J. Wysocki wrote:
> 
> > Well, I can add the printk(), but I can't guarantee that I will get the call
> > trace once again.  So far I've seen it only once after 20-25 consecutive
> > suspend-resume cycles, so ...  you get the idea.
> > 
> > However, running on a wrong CPU would very nicely explain all of the observed
> > symptoms, so I guess we can try a House M.D.-alike approach and assume that the
> > answer is "yes, we're running on the wrong CPU".  What would we do next if that
> > was the case?
> 
> If you're interested in trying a patch, I have a couple that fix things
> up here.  My "get a bigger hammer" patch would be best if it's what I
> think it is.  If it only fails once in a blue moon though, maybe not
> worth even trying.  If I could suspend/resume, I'd try it myself, but I
> have (steenking) nvidia card.  No eyecandy or resume for me, though I
> can suspend... once.

OK, please send me (a) poiter(s) to the patches.

I'll first try the patch you've just sent and report back. 

Thanks,
Rafael
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