linux-kernel - Re: [RFC PATCH v5 12/19] memory-hotplug: introduce new function arch_remove

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Message-ID: <50166379.4090305@cn.fujitsu.com>
Date:	Mon, 30 Jul 2012 18:35:37 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Heiko Carstens <heiko.carstens@...ibm.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,
	Yasuaki ISIMATU <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [RFC PATCH v5 12/19] memory-hotplug: introduce new function arch_remove_memory()

At 07/30/2012 06:23 PM, Heiko Carstens Wrote:
> On Fri, Jul 27, 2012 at 06:32:15PM +0800, Wen Congyang wrote:
>> We don't call __add_pages() directly in the function add_memory()
>> because some other architecture related things need to be done
>> before or after calling __add_pages(). So we should introduce
>> a new function arch_remove_memory() to revert the things
>> done in arch_add_memory().
>>
>> Note: the function for s390 is not implemented(I don't know how to
>> implement it for s390).
> 
> There is no hardware or firmware interface which could trigger a
> hot memory remove on s390. So there is nothing that needs to be
> implemented.

Thanks for providing this information.

According to this, arch_remove_memory() for s390 can just return -EBUSY.

Thanks
Wen Congyang

> 
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