diff options
| author | Xiu Jianfeng <xiujianfeng@huaweicloud.com> | 2023-05-24 14:54:31 +0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2023-05-24 12:22:07 -1000 |
| commit | 659db0789c2e66c5d6a52d57008e3a7401a3ffff (patch) | |
| tree | e17e77eb1bb5557863248ebb880ffe14f75bab40 /kernel/cgroup/cgroup.c | |
| parent | c33080cdc0cab7e72c5e4841cb7533d18a3130dc (diff) | |
cgroup: Update out-of-date comment in cgroup_migrate()
Commit 674b745e22b3 ("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which makes the comment out-of-date, so update it.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: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup/cgroup.c')
| -rw-r--r-- | kernel/cgroup/cgroup.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 9d809191a54f..f329f49529a2 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -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; |