v4.19.13 snapshot.
diff --git a/arch/s390/numa/numa_mode.h b/arch/s390/numa/numa_mode.h
new file mode 100644
index 0000000..dfd3e27
--- /dev/null
+++ b/arch/s390/numa/numa_mode.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NUMA support for s390
+ *
+ * Define declarations used for communication between NUMA mode
+ * implementations and NUMA core functionality.
+ *
+ * Copyright IBM Corp. 2015
+ */
+#ifndef __S390_NUMA_MODE_H
+#define __S390_NUMA_MODE_H
+
+struct numa_mode {
+ char *name; /* Name of mode */
+ void (*setup)(void); /* Initizalize mode */
+ void (*update_cpu_topology)(void); /* Called by topology code */
+ int (*__pfn_to_nid)(unsigned long pfn); /* PFN to node ID */
+ unsigned long (*align)(void); /* Minimum node alignment */
+ int (*distance)(int a, int b); /* Distance between two nodes */
+};
+
+extern const struct numa_mode numa_mode_plain;
+extern const struct numa_mode numa_mode_emu;
+
+#endif /* __S390_NUMA_MODE_H */