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Date: Mon, 13 Mar 2017 16:16:04 -0700
From: Andi Kleen <ak@linux.intel.com>
Subject: Re: WTH is going on with memory hotplug sysf interface (was: Re:
 [RFC PATCH] mm, hotplug: get rid of auto_online_blocks)
Message-ID: <20170313231604.GF32070@tassilo.jf.intel.com>
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To: Michal Hocko <mhocko@kernel.org>
Cc: Igor Mammedov <imammedo@redhat.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>, Greg KH <gregkh@linuxfoundation.org>, "K. Y. Srinivasan" <kys@microsoft.com>, David Rientjes <rientjes@google.com>, Daniel Kiper <daniel.kiper@oracle.com>, linux-api@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>, linux-s390@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, qiuxishi@huawei.com, toshi.kani@hpe.com, xieyisheng1@huawei.com, slaoub@gmail.com, iamjoonsoo.kim@lge.com, vbabka@suse.cz, Zhang Zhen <zhenzhang.zhang@huawei.com>, Reza Arbab <arbab@linux.vnet.ibm.com>, Yasuaki Ishimatsu <yasu.isimatu@gmail.com>, Tang Chen <tangchen@cn.fujitsu.com>

> and ARCH_SPARSEMEM_DEFAULT is enabeld on 64b. So I guess whatever was
> the reason to add this code back in 2006 is not true anymore. So I am
> really wondering. Do we absolutely need to assign pages which are not
> onlined yet to the ZONE_NORMAL unconditionally? Why cannot we put them
> out of any zone and wait for memory online operation to put them where
> requested?

I don't remember any specific reason. May have just been simplification.
Should be fine to use any zone.

-Andi

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