mm/page_alloc: relocate comment to be directly above code it refers to.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a235149..2793ce5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3711,12 +3711,12 @@
 		mminit_verify_zonelist();
 		cpuset_init_current_mems_allowed();
 	} else {
-		/* we have to stop all cpus to guarantee there is no user
-		   of zonelist */
 #ifdef CONFIG_MEMORY_HOTPLUG
 		if (zone)
 			setup_zone_pageset(zone);
 #endif
+		/* we have to stop all cpus to guarantee there is no user
+		   of zonelist */
 		stop_machine(__build_all_zonelists, pgdat, NULL);
 		/* cpuset refresh routine should be here */
 	}