linux-kernel - Re: [PATCH v3 2/9] suppress "Device nodeX does not have a release() function" warning

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Date:	Fri, 19 Oct 2012 02:53:56 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	wency@...fujitsu.com
Cc:	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, isimatu.yasuaki@...fujitsu.com
Subject: Re: [PATCH v3 2/9] suppress "Device nodeX does not have a release()
 function" warning

On Fri, Oct 19, 2012 at 2:46 AM,  <wency@...fujitsu.com> wrote:
> From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
>
> 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.
>
> 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>

I still think node array should be converted node pointer array and
node_device_release() free memory as other typical drivers.
However, this is acceptable as first step.

Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
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