linux-kernel - Re: [PATCH 03/11] intel-iommu: Fix AB-BA lockdep report

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Message-ID: <1352908726.2883.0.camel@lorien2>
Date:	Wed, 14 Nov 2012 08:58:46 -0700
From:	Shuah Khan <shuah.khan@...com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	stable <stable@...r.kernel.org>, roland@...estorage.com,
	linux-kernel@...r.kernel.org,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	John Kacur <jkacur@...hat.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	shuahkhan@...il.com
Subject: Re: [PATCH 03/11] intel-iommu: Fix AB-BA lockdep report

On Tue, 2012-11-13 at 19:34 -0800, Greg Kroah-Hartman wrote:
> On Tue, Nov 13, 2012 at 10:04:53PM -0500, Steven Rostedt wrote:
> > On Tue, 2012-11-13 at 19:25 -0700, Shuah Khan wrote:
> > > On Sun, 2011-12-04 at 13:54 -0500, Steven Rostedt wrote:
> > > > From: Roland Dreier <roland@...estorage.com>
> > > > 
> > > > When unbinding a device so that I could pass it through to a KVM VM, I
> > > > got the lockdep report below.  It looks like a legitimate lock
> > > > ordering problem:
> > > 
> > > Did this patch not make it into stable releases other than 3.1. I
> > > couldn't find it in any other stable tress prior to 3.1.
> > 
> > Ah, this was done in the early stable-rt releases. Where we took
> > mainline fixes as long as they were in tglx's tree. But today the
> > stable-rt tree waits for mainline fixes to come in via the stable tree
> > so we don't do something like this. That is, miss getting a fix into
> > stable.  Yeah, this should be added to 3.0. (looks to be already in 3.2
> > and 3.4).
> > 
> > 
> > Greg,
> > 
> > Can you add the following commit to the 3.0 stable tree. We've had this
> > in v3.0-rt for some time now. :-/
> > 
> > commit 3e7abe2556b583e87dabda3e0e6178a67b20d06f
> > Author: Roland Dreier <roland@...estorage.com>
> > Date:   Wed Jul 20 06:22:21 2011 -0700
> > 
> >     intel-iommu: Fix AB-BA lockdep report
> 
> I had to edit the path to the file, but it looks like it applies
> properly now, thanks.


Thanks,
-- Shuah


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