linux-kernel - Re: [Patch v4 06/12] memory-hotplug: unregister memory section on SPARSEMEM

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Date:	Tue, 04 Dec 2012 17:34:04 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Wen Congyang <wency@...fujitsu.com>
CC:	x86@...nel.org, 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,
	sparclinux@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	Jiang Liu <liuj97@...il.com>, Len Brown <len.brown@...el.com>,
	benh@...nel.crashing.org, paulus@...ba.org,
	Christoph Lameter <cl@...ux.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Jianguo Wu <wujianguo@...wei.com>
Subject: Re: [Patch v4 06/12] memory-hotplug: unregister memory section on
 SPARSEMEM_VMEMMAP

On 11/27/2012 06:00 PM, Wen Congyang wrote:
> From: Yasuaki Ishimatsu<isimatu.yasuaki@...fujitsu.com>
>
> Currently __remove_section for SPARSEMEM_VMEMMAP does nothing. But even if
> we use SPARSEMEM_VMEMMAP, we can unregister the memory_section.
>
> So the patch add unregister_memory_section() into __remove_section().
>
> CC: David Rientjes<rientjes@...gle.com>
> CC: Jiang Liu<liuj97@...il.com>
> CC: Len Brown<len.brown@...el.com>
> 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>

__remove_section() of CONFIG_SPARSEMEM_VMEMMAP will be integrated
into one in [PATCH 08/12], so I think we can merge this patch into
[PATCH 08/12].

Reviewed-by: Tang Chen <tangchen@...fujitsu.com>

> ---
>   mm/memory_hotplug.c | 13 ++++++++-----
>   1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index e741732..171610d 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -279,11 +279,14 @@ static int __meminit __add_section(int nid, struct zone *zone,
>   #ifdef CONFIG_SPARSEMEM_VMEMMAP
>   static int __remove_section(struct zone *zone, struct mem_section *ms)
>   {
> -	/*
> -	 * XXX: Freeing memmap with vmemmap is not implement yet.
> -	 *      This should be removed later.
> -	 */
> -	return -EBUSY;
> +	int ret = -EINVAL;
> +
> +	if (!valid_section(ms))
> +		return ret;
> +
> +	ret = unregister_memory_section(ms);
> +
> +	return ret;
>   }
>   #else
>   static int __remove_section(struct zone *zone, struct mem_section *ms)

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