v4.19.13 snapshot.
diff --git a/arch/mips/kernel/topology.c b/arch/mips/kernel/topology.c
new file mode 100644
index 0000000..cd3e1f8
--- /dev/null
+++ b/arch/mips/kernel/topology.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/init.h>
+#include <linux/node.h>
+#include <linux/nodemask.h>
+#include <linux/percpu.h>
+
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+
+static int __init topology_init(void)
+{
+ int i, ret;
+
+#ifdef CONFIG_NUMA
+ for_each_online_node(i)
+ register_one_node(i);
+#endif /* CONFIG_NUMA */
+
+ for_each_present_cpu(i) {
+ struct cpu *c = &per_cpu(cpu_devices, i);
+
+ c->hotpluggable = 1;
+ ret = register_cpu(c, i);
+ if (ret)
+ printk(KERN_WARNING "topology_init: register_cpu %d "
+ "failed (%d)\n", i, ret);
+ }
+
+ return 0;
+}
+
+subsys_initcall(topology_init);