diff options
| author |   Nishanth Aravamudan <nacc@linux.vnet.ibm.com> | 2014-10-17 17:50:40 -0700 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2014-10-29 09:41:22 +1100 |
| commit | 2c0a33f9861d38631245f7ef434ecad3413324fb (patch) | |
| tree | 3b5c5dbdd37bbd2b3ee8d1df44ce204f422a7aca /arch | |
| parent | powerpc/numa: use cached value of update->cpu in update_cpu_topology (diff) | |
| download | wireguard-linux-2c0a33f9861d38631245f7ef434ecad3413324fb.tar.xz wireguard-linux-2c0a33f9861d38631245f7ef434ecad3413324fb.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/mm/numa.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index ef45abf7319e..b9d1dfdbe5bb 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -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(); } |