Commit 659db078 authored by Xiu Jianfeng's avatar Xiu Jianfeng Committed by Tejun Heo
Browse files

cgroup: Update out-of-date comment in cgroup_migrate() 



Commit 674b745e ("cgroup: remove rcu_read_lock()/rcu_read_unlock()
in critical section of spin_lock_irq()") has removed the rcu_read_lock,
which makes the comment out-of-date, so update it.

tj: Updated the comment a bit.

Signed-off-by: default avatarXiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent c33080cd

kernel/cgroup/cgroup.c

+3 −3
Original line number Diff line number Diff line
@@ -2872,9 +2872,9 @@ int cgroup_migrate(struct task_struct *leader, bool threadgroup, 
	struct task_struct *task;



	/*

	 * Prevent freeing of tasks while we take a snapshot. Tasks that are

	 * already PF_EXITING could be freed from underneath us unless we

	 * take an rcu_read_lock.

	 * The following thread iteration should be inside an RCU critical

	 * section to prevent tasks from being freed while taking the snapshot.

	 * spin_lock_irq() implies RCU critical section here.

	 */

	spin_lock_irq(&css_set_lock);

	task = leader;