linux-kernel - Re: [PATCH 1/4] acpi,memory-hotplug : add memory offline code to acpi_memory_device

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Message-ID: <CAHGf_=qfzEJ0VjeYkKFVtyew+wYM-rHS4nqmXU4t7HYGuv8k9w@mail.gmail.com>
Date:	Fri, 19 Oct 2012 14:19:53 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wen Congyang <wency@...fujitsu.com>
Cc:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>, x86@...nel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, rientjes@...gle.com, liuj97@...il.com,
	len.brown@...el.com, cl@...ux.com, minchan.kim@...il.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/4] acpi,memory-hotplug : add memory offline code to acpi_memory_device_remove()

> Hmm, IIRC, if the memory is recognized from kerenl before driver initialization,
> the memory device is not managed by the driver acpi_memhotplug.

Yup.


> I think we should also deal with REMOVAL_NORMAL here now. Otherwise it will cause
> some critical problem: we unbind the device from the driver but we still use
> it. If we eject it, we have no chance to offline and remove it. It is very dangerous.

??
If resource was not allocated a driver, a driver doesn't need to
deallocate it when
error path. I haven't caught your point.
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