ARM: pgtable: remove FIRST_USER_PGD_NR

FIRST_USER_PGD_NR is now unnecessary, as this has been replaced by
FIRST_USER_ADDRESS except in the architecture code.  Fix up the last
usage of FIRST_USER_PGD_NR, and remove the definition.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/pgtable.h

@@ -138,8 +138,7 @@ extern void __pgd_error(const char *file, int line, pgd_t);
  */
 #define FIRST_USER_ADDRESS	PAGE_SIZE
 
-#define FIRST_USER_PGD_NR	1
-#define USER_PTRS_PER_PGD	((TASK_SIZE/PGDIR_SIZE) - FIRST_USER_PGD_NR)
+#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)
 
 /*
  * section address mask and size definitions.

arch/arm/mm/pgd.c

@@ -17,8 +17,6 @@
 
 #include "mm.h"
 
-#define FIRST_KERNEL_PGD_NR	(FIRST_USER_PGD_NR + USER_PTRS_PER_PGD)
-
 /*
  * need to get a 16k page for level 1
  */
@@ -32,14 +30,14 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
 	if (!new_pgd)
 		goto no_pgd;
 
-	memset(new_pgd, 0, FIRST_KERNEL_PGD_NR * sizeof(pgd_t));
+	memset(new_pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
 
 	/*
 	 * Copy over the kernel and IO PGD entries
 	 */
 	init_pgd = pgd_offset_k(0);
-	memcpy(new_pgd + FIRST_KERNEL_PGD_NR, init_pgd + FIRST_KERNEL_PGD_NR,
-		       (PTRS_PER_PGD - FIRST_KERNEL_PGD_NR) * sizeof(pgd_t));
+	memcpy(new_pgd + USER_PTRS_PER_PGD, init_pgd + USER_PTRS_PER_PGD,
+		       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
 
 	clean_dcache_area(new_pgd, PTRS_PER_PGD * sizeof(pgd_t));