[PATCH v2 9/9] powerpc/pseries: Honour current SMT state when DLPAR onlining CPUs
Laurent Dufour
ldufour at linux.ibm.com
Wed Jun 28 20:05:58 AEST 2023
From: Michael Ellerman <mpe at ellerman.id.au>
Integrate with the generic SMT support, so that when a CPU is DLPAR
onlined it is brought up with the correct SMT mode.
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
arch/powerpc/platforms/pseries/hotplug-cpu.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 61fb7cb00880..e62835a12d73 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -398,6 +398,14 @@ static int dlpar_online_cpu(struct device_node *dn)
for_each_present_cpu(cpu) {
if (get_hard_smp_processor_id(cpu) != thread)
continue;
+
+ if (!topology_is_primary_thread(cpu)) {
+ if (cpu_smt_control != CPU_SMT_ENABLED)
+ break;
+ if (!topology_smt_thread_allowed(cpu))
+ break;
+ }
+
cpu_maps_update_done();
find_and_update_cpu_nid(cpu);
rc = device_online(get_cpu_device(cpu));
--
2.41.0
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