[PATCH] freepgt: sys_mincore ignore FIRST_USER_PGD_NR

Remove use of FIRST_USER_PGD_NR from sys_mincore: it's inconsistent (no other
syscall refers to it), unnecessary (sys_mincore loops over vmas further down)
and incorrect (misses user addresses in ARM's first pgd).

Signed-off-by: Hugh Dickins <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/mincore.c

···
  	if (start & ~PAGE_CACHE_MASK)
 		goto einval;
 
-	if (start < FIRST_USER_PGD_NR * PGDIR_SIZE)
-		goto enomem;
-
 	limit = TASK_SIZE;
 	if (start >= limit)
 		goto enomem;