Index: sys/compat/linuxkpi/common/include/linux/nodemask.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/nodemask.h
+++ sys/compat/linuxkpi/common/include/linux/nodemask.h
@@ -30,6 +30,12 @@
 
 #include <linux/kernel.h>	/* pr_debug */
 
+static inline int
+num_online_nodes(void)
+{
+	return (1);
+}
+
 static inline int
 num_possible_nodes(void)
 {