mm: fix incorrect variable type in do_try_to_free_pages()

"Smarter retry of costly-order allocations" patch series change behaver of
do_try_to_free_pages().  But unfortunately ret variable type was
unchanged.

Thus an overflow is possible.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9a29901..967d30c 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1307,7 +1307,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                                        struct scan_control *sc)
 {
        int priority;
-       int ret = 0;
+       unsigned long ret = 0;
        unsigned long total_scanned = 0;
        unsigned long nr_reclaimed = 0;
        struct reclaim_state *reclaim_state = current->reclaim_state;