On 01.07.19 14:46, Michal Hocko wrote: > 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. > This was requested by Dan and I agree it is the right thing to do. In the context of paravirtualized devices (e.g., virtio-pmem), it makes sense to block functionality an arch does not support. I'll leave the decision to Andrew. -- Thanks, David / dhildenb
