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Date: Wed, 14 Jun 2017 17:12:06 +0800
From: Wei Yang <richard.weiyang@gmail.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Wei Yang <richard.weiyang@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
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        Joonsoo Kim <js1304@gmail.com>, Andi Kleen <ak@linux.intel.com>,
        David Rientjes <rientjes@google.com>,
        Daniel Kiper <daniel.kiper@oracle.com>,
        Igor Mammedov <imammedo@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Dan Williams <dan.j.williams@intel.com>
Subject: Re: [PATCH 04/14] mm, memory_hotplug: get rid of
 is_zone_device_section
Message-ID: <20170614091206.GA15768@WeideMacBook-Pro.local>
Reply-To: Wei Yang <richard.weiyang@gmail.com>
References: <20170515085827.16474-1-mhocko@kernel.org>
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On Wed, Jun 14, 2017 at 08:32:06AM +0200, Michal Hocko wrote:
>On Wed 14-06-17 14:12:59, Wei Yang wrote:
>[...]
>> Hi, Michal
>>=20
>> Not sure you missed this one or you think this is fine.
>>=20
>> Hmm... this will not happen since we must offline a whole memory_block?
>
>yes
>
>> So the memory_hotplug/unplug unit is memory_block instead of mem_section?
>
>yes.

If this is true, the check_hotplug_memory_range() should be fixed too.

This function just makes sure the range is section aligned, instead of
memory_block aligned.

>--=20
>Michal Hocko
>SUSE Labs

--=20
Wei Yang
Help you, Help me

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