linux-kernel - Re: [PATCH 5/5] lockdep: Fix the way to initialize class

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Message-ID: <20100113231923.GB12325@suse.de>
Date:	Wed, 13 Jan 2010 15:19:23 -0800
From:	Greg KH <gregkh@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 5/5] lockdep: Fix the way to initialize class_mutex for
 information of file and line

On Wed, Jan 13, 2010 at 03:17:55PM -0800, Greg KH wrote:
> On Wed, Jan 13, 2010 at 11:00:22AM +0100, Ingo Molnar wrote:
> > 
> > * Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote:
> > 
> > > This patch adds __FILE__ and __LINE__ to arguments passed for
> > > __mutex_init() called in __class_register().
> > > This affects to lockdep_map of class_mutex of struct class_private,
> > > and these will be used to make trace lock events more human friendly.
> > > 
> > > Signed-off-by: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
> > > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > > Cc: Paul Mackerras <paulus@...ba.org>
> > > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > > Cc: Greg Kroah-Hartman <gregkh@...e.de>
> > > ---
> > >  drivers/base/class.c |    3 ++-
> > >  1 files changed, 2 insertions(+), 1 deletions(-)
> > > 
> > > diff --git a/drivers/base/class.c b/drivers/base/class.c
> > > index 161746d..cc0630f 100644
> > > --- a/drivers/base/class.c
> > > +++ b/drivers/base/class.c
> > > @@ -162,7 +162,8 @@ int __class_register(struct class *cls, struct lock_class_key *key)
> > >  	klist_init(&cp->class_devices, klist_class_dev_get, klist_class_dev_put);
> > >  	INIT_LIST_HEAD(&cp->class_interfaces);
> > >  	kset_init(&cp->class_dirs);
> > > -	__mutex_init(&cp->class_mutex, "struct class mutex", key);
> > > +	__mutex_init(&cp->class_mutex, "struct class mutex", key,
> > > +		     __FILE__, __LINE__);
> > >  	error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name);
> > >  	if (error) {
> > >  		kfree(cp);
> > 
> > Greg, any objection to this type of embellishment of lock data that comes from 
> > the driver core?
> 
> No, I'll queue it up in my tree.

Er, oops, sorry, that would go through your tree, not mine :)

Feel free to add:
	Acked-by: Greg Kroah-Hartman <gregkh@...e.de>

In looking at it, this might solve the lockdep issue with the device
tree as well, I'll have to play with it once this makes it into Linus's
tree.

thanks,

greg k-h
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