Michael Bringmann [off-list ref] 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