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powerpc/vphn: Fix numa update end-loop bug 

powerpc/vphn: On Power systems with shared configurations of CPUs
and memory, there are some issues with the association of additional
CPUs and memory to nodes when hot-adding resources.  This patch
fixes an end-of-updates processing problem observed occasionally
in numa_update_cpu_topology().

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Bringmann 2017-09-08 15:47:56 -05:00 committed by Michael Ellerman
parent cee5405da4
commit 8bc931495d
1 changed files with 8 additions and 2 deletions
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10
arch/powerpc/mm/numa.c
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@ -1401,16 +1401,22 @@ int numa_update_cpu_topology(bool cpus_locked)
for_each_cpu(sibling, cpu_sibling_mask(cpu)) {
ud = &updates[i++];
ud->next = &updates[i];
ud->cpu = sibling;
ud->new_nid = new_nid;
ud->old_nid = numa_cpu_lookup_table[sibling];
cpumask_set_cpu(sibling, &updated_cpus);
if (i < weight)
ud->next = &updates[i];
}
cpu = cpu_last_thread_sibling(cpu);
}
/*
* Prevent processing of 'updates' from overflowing array
* where last entry filled in a 'next' pointer.
*/
if (i)
updates[i-1].next = NULL;
pr_debug("Topology update for the following CPUs:\n");
if (cpumask_weight(&updated_cpus)) {
for (ud = &updates[0]; ud; ud = ud->next) {