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-rw-r--r--mm/memcontrol.c31
1 files changed, 21 insertions, 10 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6144a8e7283f..b6f91d61b3af 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4834,18 +4834,28 @@ static void mem_cgroup_reparent_charges(struct mem_cgroup *memcg)
} while (usage > 0);
}
+/*
+ * Test whether @memcg has children, dead or alive. Note that this
+ * function doesn't care whether @memcg has use_hierarchy enabled and
+ * returns %true if there are child csses according to the cgroup
+ * hierarchy. Testing use_hierarchy is the caller's responsiblity.
+ */
static inline bool memcg_has_children(struct mem_cgroup *memcg)
{
- lockdep_assert_held(&memcg_create_mutex);
+ bool ret;
+
/*
- * The lock does not prevent addition or deletion to the list
- * of children, but it prevents a new child from being
- * initialized based on this parent in css_online(), so it's
- * enough to decide whether hierarchically inherited
- * attributes can still be changed or not.
+ * The lock does not prevent addition or deletion of children, but
+ * it prevents a new child from being initialized based on this
+ * parent in css_online(), so it's enough to decide whether
+ * hierarchically inherited attributes can still be changed or not.
*/
- return memcg->use_hierarchy &&
- !list_empty(&memcg->css.cgroup->children);
+ lockdep_assert_held(&memcg_create_mutex);
+
+ rcu_read_lock();
+ ret = css_next_child(NULL, &memcg->css);
+ rcu_read_unlock();
+ return ret;
}
/*
@@ -4919,7 +4929,7 @@ static int mem_cgroup_hierarchy_write(struct cgroup_subsys_state *css,
*/
if ((!parent_memcg || !parent_memcg->use_hierarchy) &&
(val == 1 || val == 0)) {
- if (list_empty(&memcg->css.cgroup->children))
+ if (!memcg_has_children(memcg))
memcg->use_hierarchy = val;
else
retval = -EBUSY;
@@ -5036,7 +5046,8 @@ static int __memcg_activate_kmem(struct mem_cgroup *memcg,
* of course permitted.
*/
mutex_lock(&memcg_create_mutex);
- if (cgroup_has_tasks(memcg->css.cgroup) || memcg_has_children(memcg))
+ if (cgroup_has_tasks(memcg->css.cgroup) ||
+ (memcg->use_hierarchy && memcg_has_children(memcg)))
err = -EBUSY;
mutex_unlock(&memcg_create_mutex);
if (err)