diff --git a/sys/compat/linuxkpi/common/include/linux/mm.h b/sys/compat/linuxkpi/common/include/linux/mm.h
--- a/sys/compat/linuxkpi/common/include/linux/mm.h
+++ b/sys/compat/linuxkpi/common/include/linux/mm.h
@@ -348,6 +348,12 @@
 extern int is_vmalloc_addr(const void *addr);
 void si_meminfo(struct sysinfo *si);
 
+static inline unsigned long
+totalram_pages(void)
+{
+	return ((unsigned long)physmem);
+}
+
 #define	unmap_mapping_range(...)	lkpi_unmap_mapping_range(__VA_ARGS__)
 void lkpi_unmap_mapping_range(void *obj, loff_t const holebegin __unused,
     loff_t const holelen, int even_cows __unused);