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

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

Signed-off-by: Ran Tian <tianran_trtr@163.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Ran Tian 2022-11-23 22:45:14 +08:00 • committed by Tejun Heo
parent 0a2cafe6c7
commit 674b745e22
1 changed files with 0 additions and 2 deletions
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2
kernel/cgroup/cgroup.c
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@ -2866,14 +2866,12 @@ int cgroup_migrate(struct task_struct *leader, bool threadgroup,
* take an rcu_read_lock. * take an rcu_read_lock.
*/ */
spin_lock_irq(&css_set_lock); spin_lock_irq(&css_set_lock);
rcu_read_lock();
task = leader; task = leader;
do { do {
cgroup_migrate_add_task(task, mgctx); cgroup_migrate_add_task(task, mgctx);
if (!threadgroup) if (!threadgroup)
break; break;
} while_each_thread(leader, task); } while_each_thread(leader, task);
rcu_read_unlock();
spin_unlock_irq(&css_set_lock); spin_unlock_irq(&css_set_lock);
return cgroup_migrate_execute(mgctx); return cgroup_migrate_execute(mgctx);