[PATCH 3.4 002/214] mm/hugetlb.c: add cond_resched_lock() in return_unused_surplus_pages()

Greg Kroah-Hartman
2014-06-05T04:19:45Z

From: "Mizuma, Masayoshi" <m.mizuma@jp.fujitsu.com>

commit 7848a4bf51b34f41fcc9bd77e837126d99ae84e3 upstream.

soft lockup in freeing gigantic hugepage fixed in commit 55f67141a892 "mm:
hugetlb: fix softlockup when a large number of hugepages are freed." can
happen in return_unused_surplus_pages(), so let's fix it.

Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
mm/hugetlb.c | 1 +
1 file changed, 1 insertion(+)

--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1082,6 +1082,7 @@ static void return_unused_surplus_pages(
while (nr_pages--) {
if (!free_pool_huge_page(h, &node_states[N_HIGH_MEMORY], 1))
break;
+ cond_resched_lock(&hugetlb_lock);
}
}