linux-kernel - Re: [RFC V7 PATCH 18/19] memory-hotplug: add node_device

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Date:	Mon, 20 Aug 2012 22:09:40 +0800
From:	Jianguo Wu <wujianguo106@...il.com>
To:	wency@...fujitsu.com
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-ia64@...r.kernel.org, cmetcalf@...era.com,
	rientjes@...gle.com, liuj97@...il.com, len.brown@...el.com,
	benh@...nel.crashing.org, paulus@...ba.org, cl@...ux.com,
	minchan.kim@...il.com, akpm@...ux-foundation.org,
	kosaki.motohiro@...fujitsu.com, isimatu.yasuaki@...fujitsu.com
Subject: Re: [RFC V7 PATCH 18/19] memory-hotplug: add node_device_release

On 2012/8/20 17:35, 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()
> 
> 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: Christoph Lameter <cl@...ux.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>
> ---
>  drivers/base/node.c |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index af1a177..9bc2f57 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -252,6 +252,13 @@ 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);
> +
> +	flush_work(&node_dev->node_work);

Hi Congyang,
	I think this should be:
#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
	flush_work(&node_dev->node_work);
#endif

	As struct node defined in node.h:
struct node {
	struct sys_device	sysdev;

#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
	struct work_struct	node_work;
#endif
};

	Thanks
	Jianguo Wu

> +	memset(node_dev, 0, sizeof(struct node));
> +}
>  
>  /*
>   * register_node - Setup a sysfs device for a node.
> @@ -265,6 +272,7 @@ 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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