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Date:   Mon, 1 Jul 2019 14:46:28 +0200
From:   Michal Hocko <>
To:     David Hildenbrand <>
        Dan Williams <>,
        Wei Yang <>,
        Igor Mammedov <>,
        Martin Schwidefsky <>,
        Heiko Carstens <>,
        Mike Rapoport <>,
        Vasily Gorbik <>,
        Oscar Salvador <>
Subject: Re: [PATCH v3 02/11] s390x/mm: Fail when an altmap is used for

On Mon 01-07-19 09:43:06, Michal Hocko wrote:
> On Mon 27-05-19 13:11:43, David Hildenbrand wrote:
> > ZONE_DEVICE is not yet supported, fail if an altmap is passed, so we
> > don't forget arch_add_memory()/arch_remove_memory() when unlocking
> > support.
> Why do we need this? Sure ZONE_DEVICE is not supported for s390 and so
> might be the case for other arches which support hotplug. I do not see
> much point in adding warning to each of them.

I would drop this one. If there is a strong reason to have something
like that it should come with a better explanation and it can be done on
Michal Hocko

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