linux-kernel - Re: [RFC][PATCH 0/3] configfs: Make nested default groups lockdep-friendly

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Message-ID: <20080520235138.GL26609@mail.oracle.com>
Date:	Tue, 20 May 2008 16:51:38 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Louis Rilling <Louis.Rilling@...labs.com>,
	linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: Re: [RFC][PATCH 0/3] configfs: Make nested default groups
	lockdep-friendly

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.

Joel

-- 

"There is no sincerer love than the love of food."  
         - George Bernard Shaw 

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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