[PATCH V2 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc

[Michael Ellerman]

Michael Bringmann <mwb at linux.vnet.ibm.com> writes:

> Removing or adding memory via the PowerPC hotplug interface shows
> anomalies in the association between memory and nodes.

What anomalies? Please describe the actual problem you're seeing, with
details, and why you think this is the correct fix.

This is a revert of 3af229f2071f ("powerpc/numa: Reset node_possible_map
to only node_online_map"), so please explain why all the things
mentioned in the change log for that commit are either wrong or no
longer true.

cheers