Re: [PATCH] powerpc/kexec: Enable SMT before waking offline CPUs

* Nysal Jan K.A. nysal@linux.ibm.com [2025-10-25 13:35:09]:

diff --git a/arch/powerpc/kexec/core_64.c b/arch/powerpc/kexec/core_64.c index 222aa326dace..ff6df43720c4 100644 --- a/arch/powerpc/kexec/core_64.c +++ b/arch/powerpc/kexec/core_64.c @@ -216,6 +216,11 @@ static void wake_offline_cpus(void) { int cpu = 0;

• lock_device_hotplug();
• cpu_smt_num_threads = threads_per_core;
• cpu_smt_control = CPU_SMT_ENABLED;
• unlock_device_hotplug();

Nit: can we add a comment mentioning why we do it and probably move to a small helper function of its own.

Otherwise looks good.

Reviewed-by: Srikar Dronamraju srikar@linux.ibm.com

for_each_present_cpu(cpu) { if (!cpu_online(cpu)) { printk(KERN_INFO "kexec: Waking offline cpu %d.\n",