On Wed, Jun 24, 2020 at 02:58:44PM +0530, Srikar Dronamraju wrote:
> A Powerpc system with multiple possible nodes and with CONFIG_NUMA
> enabled always used to have a node 0, even if node 0 does not any cpus
> or memory attached to it. As per PAPR, node affinity of a cpu is only
> available once its present / online. For all cpus that are possible but
> not present, cpu_to_node() would point to node 0.
> To ensure a cpuless, memoryless dummy node is not online, powerpc need
> to make sure all possible but not present cpu_to_node are set to a
> proper node.
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux...@kvack.org
> Cc: linux-ker...@vger.kernel.org
> Cc: Michal Hocko <mho...@suse.com>
> Cc: Mel Gorman <mgor...@suse.de>
> Cc: Vlastimil Babka <vba...@suse.cz>
> Cc: "Kirill A. Shutemov" <kir...@shutemov.name>
> Cc: Christopher Lameter <c...@linux.com>
> Cc: Michael Ellerman <m...@ellerman.id.au>
> Cc: Andrew Morton <a...@linux-foundation.org>
> Cc: Linus Torvalds <torva...@linux-foundation.org>
> Cc: Gautham R Shenoy <e...@linux.vnet.ibm.com>
> Cc: Satheesh Rajendran <sathn...@linux.vnet.ibm.com>
> Cc: David Hildenbrand <da...@redhat.com>
> Signed-off-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>

This looks good to me.

Reviewed-by: Gautham R. Shenoy <e...@linux.vnet.ibm.com>

Thanks and Regards

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