[Ocfs2-devel] [RFC][PATCH 0/3] configfs: Make nested default groups lockdep-friendly

[Arjan van de Ven]

On Tue, 20 May 2008 18:33:20 +0200
Louis Rilling <Louis.Rilling at kerlabs.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.