static int cgroup_pidlist_show(struct seq_file *s, void *v)
{
- return seq_printf(s, "%d\n", *(int *)v);
+ seq_printf(s, "%d\n", *(int *)v);
+
+ return 0;
}
static u64 cgroup_read_notify_on_release(struct cgroup_subsys_state *css,
struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss)
{
WARN_ON_ONCE(!rcu_read_lock_held());
- return idr_find(&ss->css_idr, id);
+ return id > 0 ? idr_find(&ss->css_idr, id) : NULL;
}
#ifdef CONFIG_CGROUP_DEBUG