On 07/30, Paul E. McKenney wrote: > > + rcu_read_lock(); > + for_each_process_thread(g, t) { > + if (t != current && ACCESS_ONCE(t->on_rq) && > + !is_idle_task(t)) { > + t->rcu_tasks_nvcsw = ACCESS_ONCE(t->nvcsw); > + t->rcu_tasks_holdout = 1; > + list_add(&t->rcu_tasks_holdout_list, > + &rcu_tasks_holdouts); > + } > + } > + rcu_read_unlock();
Wait, unless I missed something this can't work... The problem is, once the exiting task passes exit_notify() it can be removed from rcu lists. Now suppose that (say) proc_exit_connector() has a probe, and this task has jumped into trampoline and it was preempted there. No? Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/