Hot plug/unplug of pmem memory can cause kernel panic on POWER9
Issue
Hot plugging/unplugging of pmem memory on IBM POWER9 systems,
which has a size that is not in multiples of the expected granularity can lead to kernel panics.
On PPC64LE this issue will usually manifest itself as a kernel panic seen bwhen trying to create or destroy namespaces, which sizes are not in multiples of 16MiB.
Environment
*Red Hat Enterprise Linux (RHEL) 8.2
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