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

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Date:	Sat, 16 Jan 2010 21:55:36 +0900
From:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	Greg KH <gregkh@...e.de>
CC:	Ingo Molnar <mingo@...e.hu>, 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 2010年01月14日 08:19, Greg KH wrote:
> 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
>


Greg,

I'll add your ack in future version of this patch, thanks!
(perf lock has some build errors)

	Hitoshi
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