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Commit 25e15d83 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent 249f3468

kernel/cgroup.c

+11 −2
Original line number Diff line number Diff line
@@ -4126,10 +4126,10 @@ static void css_free_rcu_fn(struct rcu_head *rcu_head) 
	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 @@ static void css_release(struct percpu_ref *ref) 
	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)

{