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Date:   Sat, 17 Oct 2020 11:36:39 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Mike Rapoport <rppt@...nel.org>,
        Sudarshan Rajagopalan <sudaraja@...eaurora.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Mark Rutland <mark.rutland@....com>,
        Steven Price <steven.price@....com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH 1/2] mm/memory_hotplug: allow marking of memory sections
 as hotpluggable

On 17.10.20 10:26, Mike Rapoport wrote:
> On Fri, Oct 16, 2020 at 07:02:23PM -0700, Sudarshan Rajagopalan wrote:
>> Certain architectures such as arm64 doesn't allow boot memory to be
>> offlined and removed. Distinguish certain memory sections as
>> "hotpluggable" which can be marked by module drivers stating to memory
>> hotplug layer that these sections can be offlined and then removed.
> 
> I don't quite follow why marking sections as hotpluggable or not should
> be done by a device driver. Can you describe in more details your
> use-case and why there is a need to add a flag to the memory map?
> 

This seems to be related to

https://lkml.kernel.org/r/de8388df2fbc5a6a33aab95831ba7db4@codeaurora.org

After reading how the driver is trying to abuse memory hot(un)plug
infrastructure, my tentative

Nacked-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb

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