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arch_update_cpu_topology() should only return 1 when the topology has actually changed, and should return 0 otherwise. This patch fixes a potential bug where rebuild_sched_domains() would reinitialize the sched domains even when the topology hasn't changed. Signed-off-by: Jesse Larrew <jlarrew@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>