linux-kernel - Re: [PATCH] Do not use cpu_to_node() to find an offlined cpu's node.

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Message-ID: <507F6EB3.7030705@cn.fujitsu.com>
Date:	Thu, 18 Oct 2012 10:51:31 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
	miaox@...fujitsu.com, wency@...fujitsu.com,
	linux-kernel@...r.kernel.org, linux-numa@...r.kernel.org
Subject: Re: [PATCH] Do not use cpu_to_node() to find an offlined cpu's node.

On 10/18/2012 08:52 AM, David Rientjes wrote:
> On Wed, 10 Oct 2012, David Rientjes wrote:
>
> Ok, so it's been a week and these patches are still in -mm.  This is what
> I was afraid of: patches that both Peter and I nacked sitting in -mm and
> allow a NULL pointer dereference because no alternative patch exists yet
> to fix the issue correctly.
>
> Tang and Wen, are you intending on addressing these problems (i.e. not
> touching the acpi code at all and rather clearing cpu-to-node mappings at
> node hot-remove) as we've discussed or do I need to do it myself?

Hi David,

We are working on this problem. Since it is complicated, it really
takes us some time. Sorry for the delay. :)

Actually, we intend to clear cpu-to-node mappings when a whole node is
removed. But the node hot-plug code is still under development, so I
think Wen will send a fix patch soon. :)

Thanks.

>
> Thanks.
>

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