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powerpc/numa: ensure per-cpu NUMA mappings are correct on topology update

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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>
This commit is contained in:
Nishanth Aravamudan 2014-10-17 17:50:40 -07:00 committed by Michael Ellerman
parent 49f8d8c043
commit 2c0a33f986
1 changed files with 4 additions and 1 deletions
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5
arch/powerpc/mm/numa.c
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@ -1509,11 +1509,14 @@ static int update_cpu_topology(void *data)
cpu = smp_processor_id();
for (update = data; update; update = update->next) {
int new_nid = update->new_nid;
if (cpu != update->cpu)
continue;
unmap_cpu_from_node(cpu);
map_cpu_to_node(cpu, update->new_nid);
map_cpu_to_node(cpu, new_nid);
set_cpu_numa_node(cpu, new_nid);
set_cpu_numa_mem(cpu, local_memory_node(new_nid));
vdso_getcpu_init();
}