linux-kernel - Re: [PATCH RFC tip/core/rcu 05/28] lockdep: Update documentation for lock-class leak detection

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Message-ID: <1320847328.19727.2.camel@twins>
Date:	Wed, 09 Nov 2011 15:02:08 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Josh Triplett <josh@...htriplett.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, patches@...aro.org
Subject: Re: [PATCH RFC tip/core/rcu 05/28] lockdep: Update documentation
 for lock-class leak detection

On Thu, 2011-11-03 at 12:42 -0700, Paul E. McKenney wrote:
> > If so, could we simply arrange to have lockdep scream when it encounters
> > an uninitialized spinlock?
> 
> I reworded to distinguish between compile-time initialization (which will
> cause lockdep to have a separate class per instance) and run-time
> initialization (which will cause lockdep to have one class total).

Right, runtime init will key off of the call-site, compile-time init
will key off of the static data address.

> Making lockdep scream in this case might be useful, but if I understand
> correctly, that would give false positives for compile-time initialized
> global locks. 

Yeah, that's going to bring a lot of pain with it, in particular all the
early stuff like the init task etc. are all statically initialized.
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