On 12/05, Oleg Nesterov wrote: > > Yes, but on a second thought task_rcu_dereference() won't really help,
I forgot to explain why, see below.
> #define xxx_wait_event(xxx, event) {
> // comment to explain why
> WARN_ON(current->exit_state);
Otherwise this process/thread can be already (auto)reaped and wakeup
can't rely on rcu.
And task_rcu_dereference() can't help because it can return NULL in
this case.
Oleg.
