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@xxxxxxxxxxxxxxxx > Cc: linux-mm@xxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: Michal Hocko <mhocko@xxxxxxxx> > Cc: Mel Gorman <mgorman@xxxxxxx> > Cc: Vlastimil Babka <vbabka@xxxxxxx> > Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx> > Cc: Christopher Lameter <cl@xxxxxxxxx> > Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Cc: Gautham R Shenoy <ego@xxxxxxxxxxxxxxxxxx> > Cc: Satheesh Rajendran <sathnaga@xxxxxxxxxxxxxxxxxx> > Cc: David Hildenbrand <david@xxxxxxxxxx> > Signed-off-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> This looks good to me. Reviewed-by: Gautham R. Shenoy <ego@xxxxxxxxxxxxxxxxxx> -- Thanks and Regards gautham.
