{
struct task_struct *p, *g;
- spin_lock_irq(&css_set_lock);
-
- if (use_task_css_set_links)
- goto out_unlock;
-
- use_task_css_set_links = true;
-
/*
* We need tasklist_lock because RCU is not safe against
* while_each_thread(). Besides, a forking task that has passed
* tasklist if we walk through it with RCU.
*/
read_lock(&tasklist_lock);
+ spin_lock_irq(&css_set_lock);
+
+ if (use_task_css_set_links)
+ goto out_unlock;
+
+ use_task_css_set_links = true;
+
do_each_thread(g, p) {
WARN_ON_ONCE(!list_empty(&p->cg_list) ||
task_css_set(p) != &init_css_set);
}
spin_unlock(&p->sighand->siglock);
} while_each_thread(g, p);
- read_unlock(&tasklist_lock);
out_unlock:
spin_unlock_irq(&css_set_lock);
+ read_unlock(&tasklist_lock);
}
static void init_cgroup_housekeeping(struct cgroup *cgrp)