cgroup: bounce css release through css->destroy_work
css release is planned to do more and would require process context.
Bounce it through css->destroy_work.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 4a94b0b..e694f41 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4126,10 +4126,10 @@
queue_work(cgroup_destroy_wq, &css->destroy_work);
}
-static void css_release(struct percpu_ref *ref)
+static void css_release_work_fn(struct work_struct *work)
{
struct cgroup_subsys_state *css =
- container_of(ref, struct cgroup_subsys_state, refcnt);
+ container_of(work, struct cgroup_subsys_state, destroy_work);
struct cgroup_subsys *ss = css->ss;
cgroup_idr_remove(&ss->css_idr, css->id);
@@ -4137,6 +4137,15 @@
call_rcu(&css->rcu_head, css_free_rcu_fn);
}
+static void css_release(struct percpu_ref *ref)
+{
+ struct cgroup_subsys_state *css =
+ container_of(ref, struct cgroup_subsys_state, refcnt);
+
+ INIT_WORK(&css->destroy_work, css_release_work_fn);
+ queue_work(cgroup_destroy_wq, &css->destroy_work);
+}
+
static void init_and_link_css(struct cgroup_subsys_state *css,
struct cgroup_subsys *ss, struct cgroup *cgrp)
{
