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powerpc/numa: ensure per-cpu NUMA mappings are correct on topology update
We received a report of warning in kernel/sched/core.c where the sched group was NULL on an LPAR after a topology update. This seems to occur because after the topology update has moved the CPUs, cpu_to_node is returning the old value still, which ends up breaking the consistency of the NUMA topology in the per-cpu maps. Ensure that we update the per-cpu fields when we re-map CPUs. Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -1509,11 +1509,14 @@ static int update_cpu_topology(void *data)
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cpu = smp_processor_id();
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for (update = data; update; update = update->next) {
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int new_nid = update->new_nid;
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if (cpu != update->cpu)
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continue;
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unmap_cpu_from_node(cpu);
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map_cpu_to_node(cpu, update->new_nid);
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map_cpu_to_node(cpu, new_nid);
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set_cpu_numa_node(cpu, new_nid);
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set_cpu_numa_mem(cpu, local_memory_node(new_nid));
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vdso_getcpu_init();
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}
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