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