slab: mark set_up_list3s() __init

It is only ever used prior to free_initmem().

(It will cause a warning when we run the section checking, but that's a
false-positive and it simply changes the source of an existing warning, which
is also a false-positive)

Cc: Christoph Lameter <clameter@engr.sgi.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/slab.c

@@ -1949,7 +1949,7 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
  * For setting up all the kmem_list3s for cache whose buffer_size is same as
  * size of kmem_list3.
  */
-static void set_up_list3s(struct kmem_cache *cachep, int index)
+static void __init set_up_list3s(struct kmem_cache *cachep, int index)
 {
 	int node;