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

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Date:	Thu, 27 Sep 2012 18:38:31 +0800
From:	Ni zhan Chen <nizhan.chen@...il.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, kosaki.motohiro@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com
Subject: Re: [PATCH 2/4] memory-hotplug: add node_device_release

On 09/27/2012 01:45 PM, 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.
>
> So the patch implements node_device_release()
looks reasonable to me.
>
> CC: David Rientjes <rientjes@...gle.com>
> CC: Jiang Liu <liuj97@...il.com>
> CC: Len Brown <len.brown@...el.com>
> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> CC: Paul Mackerras <paulus@...ba.org>
> 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>
> ---
>   drivers/base/node.c |   11 +++++++++++
>   1 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index af1a177..07523fb 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -252,6 +252,16 @@ static inline void hugetlb_register_node(struct node *node) {}
>   static inline void hugetlb_unregister_node(struct node *node) {}
>   #endif
>   
> +static void node_device_release(struct device *dev)
> +{
> +	struct node *node_dev = to_node(dev);
> +
> +#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
> +	flush_work(&node_dev->node_work);
> +#endif
> +
> +	memset(node_dev, 0, sizeof(struct node));
> +}
>   
>   /*
>    * register_node - Setup a sysfs device for a node.
> @@ -265,6 +275,7 @@ int register_node(struct node *node, int num, struct node *parent)
>   
>   	node->dev.id = num;
>   	node->dev.bus = &node_subsys;
> +	node->dev.release = node_device_release;
>   	error = device_register(&node->dev);
>   
>   	if (!error){

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