Added definition for FIRST_USER_PGD_NR.
diff --git a/include/asm-um/pgtable.h b/include/asm-um/pgtable.h
index 6411bf0..315a07a 100644
--- a/include/asm-um/pgtable.h
+++ b/include/asm-um/pgtable.h
@@ -47,6 +47,7 @@
 #define PTRS_PER_PMD	1
 #define PTRS_PER_PGD	1024
 #define USER_PTRS_PER_PGD	(TASK_SIZE/PGDIR_SIZE)
+#define FIRST_USER_PGD_NR       0
 
 #define pte_ERROR(e) \
         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))