powerpc/pseries: PAPR persistent memory support
This patch implements support for discovering storage class memory devices at boot and for handling hotplug of new regions via RTAS hotplug events. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> [mpe: Fix CONFIG_MEMORY_HOTPLUG=n build] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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