linux-kernel - Re: [PATCH 2/4] memory-hotplug: add node_device

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Date:	Fri, 28 Sep 2012 10:30:50 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	<wency@...fujitsu.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <rientjes@...gle.com>,
	<liuj97@...il.com>, <len.brown@...el.com>,
	<benh@...nel.crashing.org>, <paulus@...ba.org>,
	<minchan.kim@...il.com>, <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/4] memory-hotplug: add node_device_release

Hi Kosaki-san,

2012/09/28 10:13, KOSAKI Motohiro wrote:
> On Thu, Sep 27, 2012 at 8:07 PM, Yasuaki Ishimatsu
> <isimatu.yasuaki@...fujitsu.com> wrote:
>> Hi Kosaki-san,
>>
>>
>> 2012/09/28 5:13, KOSAKI Motohiro wrote:
>>>
>>> On Thu, Sep 27, 2012 at 1:45 AM,  <wency@...fujitsu.com> wrote:
>>>>
>>>> From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
>>>>
>>>> When calling unregister_node(), the function shows following message at
>>>> device_release().
>>>
>>>
>>> This description doesn't have the "following message".
>>>
>>>
>>
>>>> Device 'node2' does not have a release() function, it is broken and must
>>>> be
>>>> fixed.
>>
>>
>> This is the messages. The message is shown by kobject_cleanup(), when
>> calling
>> unregister_node().
>
> If so, you should quote the message. and don't mix it with your
> subject. Moreover
> your patch title is too silly. "add node_device_release() function" is
> a way. you should
> describe the effect of the patch. e.g. suppress "Device 'nodeXX' does
> not have a release() function" warning.

What you say is correct. We should update subject and changelog.

>
> Moreover, your explanation is still insufficient. Even if
> node_device_release() is empty function, we can get rid of the
> warning.

I don't understand it. How can we get rid of the warning?

> Why do we need this node_device_release() implementation?

I think that this is a manner of releasing object related kobject.

Thanks,
Yasuaki Ishimatsu




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