Index: kernel/arch/amd64/include/mm/as.h
===================================================================
--- kernel/arch/amd64/include/mm/as.h	(revision c03ee1c304c982b593d8043411e6b003dd1c155a)
+++ kernel/arch/amd64/include/mm/as.h	(revision a7df23cc504e88bc6a076157a13a72a4666c26d9)
@@ -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