v4.19.13 snapshot.
diff --git a/arch/sh/kernel/topology.c b/arch/sh/kernel/topology.c
new file mode 100644
index 0000000..c82912a
--- /dev/null
+++ b/arch/sh/kernel/topology.c
@@ -0,0 +1,82 @@
+/*
+ * arch/sh/kernel/topology.c
+ *
+ * Copyright (C) 2007 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/init.h>
+#include <linux/percpu.h>
+#include <linux/topology.h>
+#include <linux/node.h>
+#include <linux/nodemask.h>
+#include <linux/export.h>
+
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+
+cpumask_t cpu_core_map[NR_CPUS];
+EXPORT_SYMBOL(cpu_core_map);
+
+static cpumask_t cpu_coregroup_map(int cpu)
+{
+ /*
+ * Presently all SH-X3 SMP cores are multi-cores, so just keep it
+ * simple until we have a method for determining topology..
+ */
+ return *cpu_possible_mask;
+}
+
+const struct cpumask *cpu_coregroup_mask(int cpu)
+{
+ return &cpu_core_map[cpu];
+}
+
+int arch_update_cpu_topology(void)
+{
+ unsigned int cpu;
+
+ for_each_possible_cpu(cpu)
+ cpu_core_map[cpu] = cpu_coregroup_map(cpu);
+
+ return 0;
+}
+
+static int __init topology_init(void)
+{
+ int i, ret;
+
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+ for_each_online_node(i)
+ register_one_node(i);
+#endif
+
+ for_each_present_cpu(i) {
+ struct cpu *c = &per_cpu(cpu_devices, i);
+
+ c->hotpluggable = 1;
+
+ ret = register_cpu(c, i);
+ if (unlikely(ret))
+ printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n",
+ __func__, i, ret);
+ }
+
+#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
+ /*
+ * In the UP case, make sure the CPU association is still
+ * registered under each node. Without this, sysfs fails
+ * to make the connection between nodes other than node0
+ * and cpu0.
+ */
+ for_each_online_node(i)
+ if (i != numa_node_id())
+ register_cpu_under_node(raw_smp_processor_id(), i);
+#endif
+
+ return 0;
+}
+subsys_initcall(topology_init);