linux-kernel - Re: [patch v2 3/6] mm/memory_hotplug: Disable memory hotremove for 32bit

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Date:	Sun, 26 May 2013 20:45:08 +0800
From:	Hush Bensen <hush.bensen@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Michal Hocko <mhocko@...e.cz>
CC:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org
Subject: Re: [patch v2 3/6] mm/memory_hotplug: Disable memory hotremove for
 32bit

于 2013/5/26 19:58, KOSAKI Motohiro 写道:
>>> As KOSAKI Motohiro mentioned, memory hotplug don't support 32bit since
>>> it was born,
>> Why? any reference? This reasoning is really weak.
> I have no seen any highmem support in memory hotplug code and I don't think this
> patch fixes all 32bit highmem issue. If anybody are interesting to
> support it, it is good thing. But in fact, _now_ it is broken when
> enable HIGHMEM.

But online/offline memory can work well when enable HIGHMEM, isn't it?

> So, I just want to mark broken until someone want to support highmem
> and verify overall.
>
> And, yes, this patch is no good. Kconfig doesn't describe why disable
> when highmem.
> So,
>
> depends on 64BIT || !HIGHMEM || BROKEN
>
> maybe clear documentation more.
>
> --
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