From 674b745e22b3caae48ad20422795eefd3f832a7b Mon Sep 17 00:00:00 2001 From: Ran Tian Date: Wed, 23 Nov 2022 22:45:14 +0800 Subject: [PATCH] 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: Ran Tian Signed-off-by: Tejun Heo --- kernel/cgroup/cgroup.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index f2743a4..3028f6b 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -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); -- 2.7.4