On 08/01, Paul E. McKenney wrote: > > On Fri, Aug 01, 2014 at 05:53:10PM +0200, Oleg Nesterov wrote: > > 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? > > OK, this sounds to me like another vote for get_task_struct() as used > in the v3 series. Or am I missing something?
Ah. Sorry for confusion, I replied to the wrong email, let me resend... 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/