summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms
diff options
context:
space:
mode:
authorOscar Salvador <osalvador@suse.de>2022-04-11 10:49:34 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2022-05-22 08:58:30 +0300
commit48b63961c84671df4c4a4451c40057e34b26df1a (patch)
treedd208eeed7027b28ba46b2ed06b33e15a49faebe /arch/powerpc/platforms
parent9a9c5ff5fff87eb1a43db0d899473554e408fd7b (diff)
downloadlinux-48b63961c84671df4c4a4451c40057e34b26df1a.tar.xz
powerpc/numa: Associate numa node to its cpu earlier
powerpc is the only platform that do not rely on cpu_up()->try_online_node() to bring up a numa node, and special cases it, instead, deep in its own machinery: dlpar_online_cpu find_and_online_cpu_nid try_online_node This should not be needed, but the thing is that the try_online_node() from cpu_up() will not apply on the right node, because cpu_to_node() will return the old mapping numa<->cpu that gets set on boot stage for all possible cpus. That can be seen easily if we try to print out the numa node passed to try_online_node() in cpu_up(). The thing is that the numa<->cpu mapping does not get updated till a much later stage in start_secondary: start_secondary: set_numa_node(numa_cpu_lookup_table[cpu]) But we do not really care, as we already now the CPU <-> NUMA associativity back in find_and_online_cpu_nid(), so let us make use of that and set the proper numa<->cpu mapping, so cpu_to_node() in cpu_up() returns the right node and try_online_node() can do its work. Signed-off-by: Oscar Salvador <osalvador@suse.de> Tested-by: Geetika Moolchandani <Geetika.Moolchandani1@ibm.com> Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220411074934.4632-1-osalvador@suse.de
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r--arch/powerpc/platforms/pseries/hotplug-cpu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index b81fc846d99c..0f8cd8b06432 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -398,7 +398,7 @@ static int dlpar_online_cpu(struct device_node *dn)
if (get_hard_smp_processor_id(cpu) != thread)
continue;
cpu_maps_update_done();
- find_and_online_cpu_nid(cpu);
+ find_and_update_cpu_nid(cpu);
rc = device_online(get_cpu_device(cpu));
if (rc) {
dlpar_offline_cpu(dn);