linux-kernel - Re: Using nested locking for spin_lock

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Message-ID: <2191191.ipEiEk2XX9@bentobox>
Date:	Thu, 29 Mar 2012 12:41 +0200
From:	Sven Eckelmann <sven@...fation.org>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	simon.wunderlich@...03.tu-chemnitz.de,
	Marek Lindner <lindner_marek@...oo.de>
Subject: Re: Using nested locking for spin_lock_bh

On Thursday, March 29, 2012 11:11:37 AM Yong Zhang wrote:
> On Wed, Mar 28, 2012 at 06:36:39PM +0200, Sven Eckelmann wrote:
> > Hi,
> > 
> > I started to run some experimental batman-adv code inside some virtual
> > machines with different debugging functions enabled. One of them was
> > lockdep. There we noticed a false positive for a lock class that is
> > actually used in two different data structures.
> 
> Hmm, I think you can initialize the lock class in the two differnent data
> structures with differnt lock_class_key.

Thanks. I think I understand the problem now a little bit better and could 
resolve it using lockdep_set_class.

Kind regards,
	Sven
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