diff --git a/arch/s390/kernel/processor.c b/arch/s390/kernel/processor.c
index 41172093160e6426ff8b57e7f7073c4911e98773..39bf777e140ee3671967c3146f61eeb87ce20212 100644
--- a/arch/s390/kernel/processor.c
+++ b/arch/s390/kernel/processor.c
@@ -160,6 +160,7 @@ static void show_cpu_topology(struct seq_file *m, unsigned long n)
 	seq_printf(m, "drawer id       : %d\n", topology_drawer_id(n));
 	seq_printf(m, "dedicated       : %d\n", topology_cpu_dedicated(n));
 	seq_printf(m, "address         : %d\n", smp_cpu_get_cpu_address(n));
+	seq_printf(m, "siblings        : %d\n", cpumask_weight(topology_core_cpumask(n)));
 	seq_printf(m, "cpu cores       : %d\n", topology_booted_cores(n));
 #endif /* CONFIG_SCHED_TOPOLOGY */
 }