mm-fix-tracing-in-free_pcppages_bulk-fix

add comment

Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 76aff40ae9c32a4dd29bdba28a6632859198e8b6..a214abe436f9b5303e706c80e17e216afa5ed79e 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -667,7 +667,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
                        batch_free = to_free;
 
                do {
-                       int mt;
+                       int mt; /* migratetype of the to-be-freed page */
 
                        page = list_entry(list->prev, struct page, lru);
                        /* must delete as __free_one_page list manipulates */