On 10/16, Kirill Tkhai wrote: > > Cool! Elegant fix. We set PF_EXITING in exit_signals(), which is earlier > than release_task() is called.
OK, thanks, I am sending the patch... > Shouldn't we use smp_rmb/smp_wmb here? No, we do not. call_rcu(delayed_put_pid) itself implies the barrier on all CPUs. IOW, by the time RCU actually calls delayed_put_pid() every CPU must see all memory changes which were done before call_rcu() was called. And otoh, all rcu-read-lock critical sections which could miss PF_EXITING should be already finished. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
