linux-kernel - Re: Deadlock scenario in regulator core

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Message-ID: <20110323104230.GA778@opensource.wolfsonmicro.com>
Date:	Wed, 23 Mar 2011 10:42:30 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	David Collins <collinsd@...eaurora.org>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Deadlock scenario in regulator core

On Tue, Mar 22, 2011 at 08:38:54PM -0400, Steven Rostedt wrote:
> On Wed, 2011-03-23 at 00:01 +0000, Mark Brown wrote:

> > What's a mutex type?  I have to say this is the first time I've heard of
> > mutex types and the documentation in mutex.c and mutex-design.txt isn't
> > precisely verbose on what mutex_lock_nested() is for or how one would
> > pick subclass.

> Sorry, I said "mutex type" as a synonym to "lock class". A lock class is
> pretty much how a lock is defined.

OK, lock class can be grepped which was the main thing, thanks.

> There's better documentation about this in the lockdep-design.txt.

That's helpful, though it doesn't really say anything about how one
picks subclass?
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