linux-kernel - Re: [Patch 0/2] sysfs: fix s

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Date:	Fri, 26 Feb 2010 21:54:29 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Alan Stern <stern@...land.harvard.edu>
cc:	Greg KH <gregkh@...e.de>, Peter Zijlstra <peterz@...radead.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Cong Wang <amwang@...hat.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Miles Lane <miles.lane@...il.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch 0/2] sysfs: fix s_active lockdep warning

On Fri, 26 Feb 2010, Alan Stern wrote:
> On Thu, 4 Feb 2010, Thomas Gleixner wrote:
> 
> > On Thu, 4 Feb 2010, Greg KH wrote:
> > > > However in view of the other difficulties, it still doesn't seem
> > > > possible to make device mutexes work with lockdep.  I suggest removing 
> > > > Thomas's patch.
> > > 
> > > Unless Thomas or anyone else thinks of something that can solve these
> > > problems, I will do so.
> > 
> > Hmm, I have not seen those lockdep splats on -rt where we have the
> > mutex conversion for quite some time already. Need to look at it.
> 
> Thomas, did you ever figure out what was going on?  It would be nice to 
> know why the -rt kernels don't have any lockdep problems associated 
> with the device mutexes.

Yes, it just did not happen on the systems which I tested with lockdep
enabled, but I found a box where it triggered.

Sorry should have tested better. :(

Thanks,

	tglx
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