cgroup,rcu: convert call_rcu(__free_css_id_cb) to kfree_rcu() (025cea99) · Commits · 戴 / test

The rcu callback __free_css_id_cb() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(__free_css_id_cb). Signed-off-by:

kernel/cgroup.c

+1 −9

Original line number	Diff line number	Diff line
		@@ -4610,14 +4610,6 @@ bool css_is_ancestor(struct cgroup_subsys_state *child,
		return ret;
		}

		static void __free_css_id_cb(struct rcu_head *head)
		{
		struct css_id *id;

		id = container_of(head, struct css_id, rcu_head);
		kfree(id);
		}

		void free_css_id(struct cgroup_subsys ss, struct cgroup_subsys_state css)
		{
		struct css_id *id = css->id;
		@@ -4632,7 +4624,7 @@ void free_css_id(struct cgroup_subsys ss, struct cgroup_subsys_state css)
		spin_lock(&ss->id_lock);
		idr_remove(&ss->idr, id->id);
		spin_unlock(&ss->id_lock);
		call_rcu(&id->rcu_head, __free_css_id_cb);
		kfree_rcu(id, rcu_head);
		}
		EXPORT_SYMBOL_GPL(free_css_id);