linux-kernel - Re: [PATCH v2 1/4] mm/memory-hotplug: fix lowmem count overflow when offline pages

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Message-ID: <CAHGf_=rq7vByQVmVGyFk51q_d=ftpjuMjNXSszcfHWmZMu6jjw@mail.gmail.com>
Date:	Sun, 26 May 2013 10:59:46 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Liu Jiang <liuj97@...il.com>
Cc:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH v2 1/4] mm/memory-hotplug: fix lowmem count overflow when
 offline pages

> Hi KOSAKI,
>         Could you please help to give more information on the background
> about why 32bit platforms with highmem can't support memory hot-removal?

It doesn't impossible. Just nobody did. I was playing these code as a
maintainer a while
and I saw all of patches doesn't handle highmem correctly. But I
didn't refuse because
I know it's not a regression.

> We are trying to enable memory hot-removal on some 32bit platforms with
> highmem, really appreciate your help here!

But, if you guys have a strong motivation, it's a very good news. I
have no objection not to mark it broken and accept your contributions.
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