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

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Message-ID: <20080520095810.1d50d247@infradead.org>
Date:	Tue, 20 May 2008 09:58:10 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Louis Rilling <Louis.Rilling@...labs.com>
Cc:	Joel.Becker@...cle.com, 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, 20 May 2008 18:33:20 +0200
Louis Rilling <Louis.Rilling@...labs.com> wrote:

> Hi all,
> 
> The following patches fix lockdep warnings resulting from (correct)
> recursive locking in configfs.
> 
> Current lockdep annotations for inode mutexes in configfs are
> lockdep-friendly provided that:
> 1/ config_groups have at most one level of default groups (see
>    configfs_attach_group()),
> 2/ config_groups having default groups are never removed (see
>    configfs_detach_prep()).
> 
> Since lockdep does not handle such correct recursion, the idea is to
> insert lockdep_off()/lockdep_on() for inode mutexes as soon as the
> level of recursion of the I_MUTEX_PARENT -> I_MUTEX_CHILD dependency
> pattern increases.

I'm... not entirely happy with such a solution ;(

there must be a better one.
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