While debugging issue in realtime kernel i found a scenario which resulted in infinite loop resulting because of empty pcp->lists and valid 'to_free' value. This patch is to add 'WARN_ON' in function 'free_pcppages_bulk' if there is possibility of infinite loop because of any bug in code. Signed-off-by: Pankaj Gupta <pagupta@xxxxxxxxxx> --- mm/page_alloc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 3fbe73a..07d3080 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1096,6 +1096,8 @@ static void free_pcppages_bulk(struct zone *zone, int count, if (++migratetype == MIGRATE_PCPTYPES) migratetype = 0; list = &pcp->lists[migratetype]; + + WARN_ON(batch_free > MIGRATE_PCPTYPES); } while (list_empty(list)); /* This is the only non-empty list. Free them all. */ -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>