linux-kernel - Re: [PATCH 2/2]suppress "Device nodeX does not have a release() function" warning

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Date:	Fri, 12 Oct 2012 09:13:50 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<liuj97@...il.com>, <minchan.kim@...il.com>,
	<akpm@...ux-foundation.org>, <kosaki.motohiro@...fujitsu.com>,
	<wency@...fujitsu.com>
Subject: Re: [PATCH 2/2]suppress "Device nodeX does not have a release() function"
 warning

2012/10/12 5:31, David Rientjes wrote:
> On Thu, 11 Oct 2012, Yasuaki Ishimatsu wrote:
>
>> When calling unregister_node(), the function shows following message at
>> device_release().
>>
>> "Device 'node2' does not have a release() function, it is broken and must
>> be fixed."
>>
>> The reason is node's device struct does not have a release() function.
>>
>> So the patch registers node_device_release() to the device's release()
>> function for suppressing the warning message. Additionally, the patch adds
>> memset() to initialize a node struct into register_node(). Because the node
>> struct is part of node_devices[] array and it cannot be freed by
>> node_device_release(). So if system reuses the node struct, it has a garbage.
>>
>
> Nice catch on reuse of the statically allocated node_devices[] for node
> hotplug.
>
>> CC: David Rientjes <rientjes@...gle.com>
>> CC: Jiang Liu <liuj97@...il.com>
>> Cc: Minchan Kim <minchan.kim@...il.com>
>> CC: Andrew Morton <akpm@...ux-foundation.org>
>> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
>> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
>> Signed-off-by: Wen Congyang <wency@...fujitsu.com>
>
> Can register_node() be made static in drivers/base/node.c and its
> declaration removed from linux/node.h?

Yah. I'll fix it.

Thanks,
Yasuaki Ishimatsu

>
> Acked-by: David Rientjes <rientjes@...gle.com>
>


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