Re: Using nested locking for spin_lock_bh

From: Sven Eckelmann
Date: Thu Mar 29 2012 - 06:41:25 EST

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,

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