Re: [RFC][PATCH 0/3] configfs: Make nested default groupslockdep-friendly

From: Peter Zijlstra
Date: Wed May 21 2008 - 05:20:26 EST

On Tue, 2008-05-20 at 16:51 -0700, Joel Becker wrote:
> On Tue, May 20, 2008 at 03:35:43PM -0700, Arjan van de Ven wrote:
> > not quite what I meant; what I meant is more like how sched.c deals
> > with per cpu queues:
> >
> > (from sched.c)
> >
> > spin_lock_init(&rq->lock);
> > lockdep_set_class(&rq->lock, &rq->rq_lock_key);
> Looking at this, it's taking the address of the struct
> lock_class_key as the actual key. Thus, if we tie one of these guys to
> the structure we're representing, we get lock safety...except that we're
> talking about i_mutex here, and we want to interact with the VFS's use
> thereof.

Also bear in mind that the lock_class_key structure must be in static

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