diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index f441ae3..7dd7ce4 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -48,6 +48,7 @@
 #include <asm/kdebug.h>
 #include <asm/numa.h>
 #include <asm/cacheflush.h>
+#include <asm/init.h>
 
 /*
  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
@@ -283,10 +284,6 @@
 	}
 }
 
-extern unsigned long __initdata e820_table_start;
-extern unsigned long __meminitdata e820_table_end;
-extern unsigned long __meminitdata e820_table_top;
-
 static __ref void *alloc_low_page(unsigned long *phys)
 {
 	unsigned long pfn = e820_table_end++;