[PATCH 6/6] hugetlb: do not fail in hugetlb_cgroup_pre_destroy

[Michal Hocko <mhocko@suse.cz>]

Now that pre_destroy callbacks are called from within cgroup_lock and
the cgroup has been checked to be empty without any children then there
is no other way to fail.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
---
 mm/hugetlb_cgroup.c |   11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index a3f358f..dc595c6 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -159,14 +159,9 @@ static int hugetlb_cgroup_pre_destroy(struct cgroup *cgroup)
 {
 	struct hstate *h;
 	struct page *page;
-	int ret = 0, idx = 0;
+	int idx = 0;
 
 	do {
-		if (cgroup_task_count(cgroup) ||
-		    !list_empty(&cgroup->children)) {
-			ret = -EBUSY;
-			goto out;
-		}
 		for_each_hstate(h) {
 			spin_lock(&hugetlb_lock);
 			list_for_each_entry(page, &h->hugepage_activelist, lru)
@@ -177,8 +172,8 @@ static int hugetlb_cgroup_pre_destroy(struct cgroup *cgroup)
 		}
 		cond_resched();
 	} while (hugetlb_cgroup_have_usage(cgroup));
-out:
-	return ret;
+
+	return 0;
 }
 
 int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
-- 
1.7.10.4