Date: Wed, 23 Mar 2011 10:42:30 +0000
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: David Collins <collinsd@codeaurora.org>,
        Liam Girdwood <lrg@slimlogic.co.uk>, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@elte.hu>
Subject: Re: Deadlock scenario in regulator core
Message-ID: <20110323104230.GA778@opensource.wolfsonmicro.com>
References: <4D891C59.1030009@codeaurora.org>
 <20110322223702.GO14675@home.goodmis.org>
 <4D892C0A.1090606@codeaurora.org>
 <1300835998.14261.13.camel@gandalf.stny.rr.com>
 <20110323000100.GB2529@opensource.wolfsonmicro.com>
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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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