v4.19.13 snapshot.
diff --git a/tools/perf/util/mem2node.h b/tools/perf/util/mem2node.h
new file mode 100644
index 0000000..59c4752
--- /dev/null
+++ b/tools/perf/util/mem2node.h
@@ -0,0 +1,19 @@
+#ifndef __MEM2NODE_H
+#define __MEM2NODE_H
+
+#include <linux/rbtree.h>
+#include "env.h"
+
+struct phys_entry;
+
+struct mem2node {
+ struct rb_root root;
+ struct phys_entry *entries;
+ int cnt;
+};
+
+int mem2node__init(struct mem2node *map, struct perf_env *env);
+void mem2node__exit(struct mem2node *map);
+int mem2node__node(struct mem2node *map, u64 addr);
+
+#endif /* __MEM2NODE_H */