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From: Thomas Gleixner <tglx@linutronix.de>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg KH <gregkh@suse.de>, Peter Zijlstra <peterz@infradead.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Cong Wang <amwang@redhat.com>,
	Kernel development list <linux-kernel@vger.kernel.org>,
	Tejun Heo <tj@kernel.org>, Miles Lane <miles.lane@gmail.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [Patch 0/2] sysfs: fix s_active lockdep warning
Date: Fri, 26 Feb 2010 21:54:29 +0100 (CET)	[thread overview]
Message-ID: <alpine.LFD.2.00.1002262153050.4245@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1002261435100.2029-100000@iolanthe.rowland.org>

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

  reply	other threads:[~2010-02-26 20:55 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-29  7:01 [Patch 0/2] sysfs: fix s_active lockdep warning Amerigo Wang
2010-01-29  7:02 ` [Patch 1/2] sysfs: add support for lockdep subclasses to s_active Amerigo Wang
2010-01-29  7:02 ` [PATCH 2/2] sysfs: fix the incomplete part of subclass support for s_active Amerigo Wang
2010-01-29  7:21 ` [Patch 0/2] sysfs: fix s_active lockdep warning Eric W. Biederman
2010-01-29  8:38   ` Cong Wang
2010-01-29 13:44     ` Eric W. Biederman
2010-01-29 14:22       ` Greg KH
2010-01-29 17:57         ` Peter Zijlstra
2010-01-29 18:10           ` Greg KH
2010-01-29 18:14             ` Peter Zijlstra
2010-01-29 18:21               ` Greg KH
2010-01-29 20:10                 ` Peter Zijlstra
2010-01-29 20:30                   ` Eric W. Biederman
2010-02-04 11:38                     ` Peter Zijlstra
2010-02-04 16:35                       ` Alan Stern
2010-02-04 16:41                         ` Peter Zijlstra
2010-02-04 18:37                           ` Alan Stern
2010-02-05 10:18                             ` Peter Zijlstra
2010-02-05 15:30                               ` Alan Stern
2010-02-05 15:41                                 ` Peter Zijlstra
2010-02-07  9:22                                   ` Dave Young
2010-02-08  3:08                                     ` Cong Wang
2010-02-08  3:14                                       ` Dave Young
2010-02-08  3:30                                         ` Cong Wang
2010-02-08  3:06                                 ` Cong Wang
2010-02-08 15:38                               ` Alan Stern
2010-02-04 16:46                         ` Peter Zijlstra
2010-02-04 18:40                           ` Alan Stern
2010-02-05  3:09                             ` Cong Wang
2010-02-05  4:06                               ` Alan Stern
2010-02-04 16:46                         ` Greg KH
2010-02-04 16:59                           ` Thomas Gleixner
2010-02-26 19:36                             ` Alan Stern
2010-02-26 20:54                               ` Thomas Gleixner [this message]
2010-02-05  3:43                       ` Cong Wang
2010-02-05  8:55                       ` Eric W. Biederman
2010-01-29 20:25         ` Eric W. Biederman
2010-01-30  5:30           ` Greg KH
2010-01-29 18:02   ` Peter Zijlstra

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