Hello. I am not sure, but I think this patch incorrect.
> @@ -466,6 +482,7 @@ repeat: > set_running_timer(base, timer); > smp_wmb(); > timer->base = NULL; ------> WINDOW <------ > + set_last_running(timer, base); > spin_unlock_irq(&base->lock); Suppose it is the first invocation of timer, so timer->last_running == NULL. What if del_timer_sync() happens in that window? del_timer_sync: del_timer(); // timer->base == NULL, returns base = timer->last_running; if (base) // no, it is still NULL ... if (timer->base != NULL || timer->last_running != base) goto del_again; // not taken return; I think it is not enough to exchange these 2 lines in __run_timers, we also need barriers. 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/