#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-3))
#define USER_PTRS_PER_PGD (5*PTRS_PER_PGD/8) /* regions 0-4 are user regions */
-#define FIRST_USER_PGD_NR 0
+#define FIRST_USER_ADDRESS 0
/*
* Definitions for second level: