diff --git a/include/linux/node.h b/include/linux/node.h
new file mode 100644
index 0000000..257bb3d
--- /dev/null
+++ b/include/linux/node.h
@@ -0,0 +1,122 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * include/linux/node.h - generic node definition
+ *
+ * This is mainly for topological representation. We define the 
+ * basic 'struct node' here, which can be embedded in per-arch 
+ * definitions of processors.
+ *
+ * Basic handling of the devices is done in drivers/base/node.c
+ * and system devices are handled in drivers/base/sys.c. 
+ *
+ * Nodes are exported via driverfs in the class/node/devices/
+ * directory. 
+ */
+#ifndef _LINUX_NODE_H_
+#define _LINUX_NODE_H_
+
+#include <linux/device.h>
+#include <linux/cpumask.h>
+#include <linux/workqueue.h>
+
+struct node {
+	struct device	dev;
+
+#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
+	struct work_struct	node_work;
+#endif
+};
+
+struct memory_block;
+extern struct node *node_devices[];
+typedef  void (*node_registration_func_t)(struct node *);
+
+#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
+extern int link_mem_sections(int nid, unsigned long start_pfn,
+			     unsigned long end_pfn);
+#else
+static inline int link_mem_sections(int nid, unsigned long start_pfn,
+				    unsigned long end_pfn)
+{
+	return 0;
+}
+#endif
+
+extern void unregister_node(struct node *node);
+#ifdef CONFIG_NUMA
+/* Core of the node registration - only memory hotplug should use this */
+extern int __register_one_node(int nid);
+
+/* Registers an online node */
+static inline int register_one_node(int nid)
+{
+	int error = 0;
+
+	if (node_online(nid)) {
+		struct pglist_data *pgdat = NODE_DATA(nid);
+		unsigned long start_pfn = pgdat->node_start_pfn;
+		unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
+
+		error = __register_one_node(nid);
+		if (error)
+			return error;
+		/* link memory sections under this node */
+		error = link_mem_sections(nid, start_pfn, end_pfn);
+	}
+
+	return error;
+}
+
+extern void unregister_one_node(int nid);
+extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
+extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
+extern int register_mem_sect_under_node(struct memory_block *mem_blk,
+						void *arg);
+extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
+					   unsigned long phys_index);
+
+#ifdef CONFIG_HUGETLBFS
+extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
+					 node_registration_func_t unregister);
+#endif
+#else
+static inline int __register_one_node(int nid)
+{
+	return 0;
+}
+static inline int register_one_node(int nid)
+{
+	return 0;
+}
+static inline int unregister_one_node(int nid)
+{
+	return 0;
+}
+static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
+{
+	return 0;
+}
+static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
+{
+	return 0;
+}
+static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
+							void *arg)
+{
+	return 0;
+}
+static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
+						  unsigned long phys_index)
+{
+	return 0;
+}
+
+static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
+						node_registration_func_t unreg)
+{
+}
+#endif
+
+#define to_node(device) container_of(device, struct node, dev)
+
+#endif /* _LINUX_NODE_H_ */