uml: remove map_cb

John Reiser noticed that a physical memory region was being mapped twice.

This patch fixes that, and it inlines the responsible function, as that had
only one caller.

Cc: John Reiser <jreiser@BitWagon.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/kernel/mem.c

@@ -36,11 +36,6 @@ int kmalloc_ok = 0;
 /* Used during early boot */
 static unsigned long brk_end;
 
-static void map_cb(void *unused)
-{
-	map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
-}
-
 #ifdef CONFIG_HIGHMEM
 static void setup_highmem(unsigned long highmem_start,
 			  unsigned long highmem_len)
@@ -68,8 +63,7 @@ void __init mem_init(void)
 	 * to be turned on.
 	 */
 	brk_end = (unsigned long) UML_ROUND_UP(sbrk(0));
-	map_cb(NULL);
-	initial_thread_cb(map_cb, NULL);
+	map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
 	free_bootmem(__pa(brk_end), uml_reserved - brk_end);
 	uml_reserved = brk_end;