[PATCH] mm: un-needed add-store operation wastes a few bytes

Un-needed add-store operation wastes a few bytes.
8 bytes wasted with -O2, on a ppc.
Signed-off-by: Nnkalmala <nkalmala@gmail.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

mm/page_alloc.c

@@ -853,7 +853,7 @@ static struct page *buffered_rmqueue(struct zonelist *zonelist,
 		pcp = &zone_pcp(zone, cpu)->pcp[cold];
 		local_irq_save(flags);
 		if (!pcp->count) {
-			pcp->count += rmqueue_bulk(zone, 0,
+			pcp->count = rmqueue_bulk(zone, 0,
 						pcp->batch, &pcp->list);
 			if (unlikely(!pcp->count))
 				goto failed;