Commit 674b745e authored by Ran Tian's avatar Ran Tian Committed by Tejun Heo
Browse files

cgroup: remove rcu_read_lock()/rcu_read_unlock() in critical section of spin_lock_irq() 



spin_lock_irq() already disable preempt, so remove rcu_read_lock().

Signed-off-by: default avatarRan Tian <tianran_trtr@163.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 0a2cafe6

kernel/cgroup/cgroup.c

+0 −2
Original line number Diff line number Diff line
@@ -2866,14 +2866,12 @@ int cgroup_migrate(struct task_struct *leader, bool threadgroup, 
	 * take an rcu_read_lock.

	 */

	spin_lock_irq(&css_set_lock);

	rcu_read_lock();

	task = leader;

	do {

		cgroup_migrate_add_task(task, mgctx);

		if (!threadgroup)

			break;

	} while_each_thread(leader, task);

	rcu_read_unlock();

	spin_unlock_irq(&css_set_lock);



	return cgroup_migrate_execute(mgctx);