Index: kernel/arch/amd64/include/mm/as.h
===================================================================
--- kernel/arch/amd64/include/mm/as.h	(revision 4fb6bf36a77314bbd0cf9617e098289987ba7351)
+++ kernel/arch/amd64/include/mm/as.h	(revision 2db4ac8457acaa2a1655dc42d95e27e27dbdc03f)
@@ -39,5 +39,5 @@
 
 #define KERNEL_ADDRESS_SPACE_START_ARCH		(unsigned long) 0xffff800000000000
-#define KERNEL_ADDRESS_SPACE_END_ARCH		(unsigned long) 0xffffffffffffffff
+#define KERNEL_ADDRESS_SPACE_END_ARCH		(unsigned long) 0xffffffff80000000
 #define USER_ADDRESS_SPACE_START_ARCH		(unsigned long) 0x0000000000000000
 #define USER_ADDRESS_SPACE_END_ARCH		(unsigned long) 0x00007fffffffffff