[PATCH 10/10] powerpc/pseries: Honour current SMT state when DLPAR onlining CPUs
From: Laurent Dufour <hidden>
Date: 2023-06-15 15:47:54
Also in:
linux-arch, lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
From: Michael Ellerman <mpe@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@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