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

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Message-ID: <Pine.LNX.4.44L0.1002261435100.2029-100000@iolanthe.rowland.org>
Date:	Fri, 26 Feb 2010 14:36:30 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Thomas Gleixner <tglx@...utronix.de>
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 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.

Alan Stern

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