Re: [PATCH v3 02/11] s390x/mm: Fail when an altmap is used for arch_add_memory()

Michal Hocko
2019-07-01T12:46:28Z

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
top.
--
Michal Hocko
SUSE Labs