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The build is failing with CONFIG_NUMA=n and some compiler versions: arch/powerpc/platforms/pseries/hotplug-cpu.o: In function `dlpar_online_cpu': hotplug-cpu.c:(.text+0x12c): undefined reference to `timed_topology_update' arch/powerpc/platforms/pseries/hotplug-cpu.o: In function `dlpar_cpu_remove': hotplug-cpu.c:(.text+0x400): undefined reference to `timed_topology_update' Fix it by moving the empty version of timed_topology_update() into the existing #ifdef block, which has the right guard of SPLPAR && NUMA. Fixes: cee5405da402 ("powerpc/hotplug: Improve responsiveness of hotplug change") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>