On 2020-06-09 11:21:44 [-0500], Tom Zanussi wrote:
> index 73dae64bfc9c..4f37a6173ab9 100644
> --- a/kernel/softirq.c
> +++ b/kernel/softirq.c
> @@ -947,10 +947,12 @@ static void __tasklet_schedule_common(struct tasklet_struct *t,
> * is locked before adding it to the list.
> */
> if (test_bit(TASKLET_STATE_SCHED, &t->state)) {
> +#if defined(CONFIG_SMP)
> if (test_and_set_bit(TASKLET_STATE_CHAINED, &t->state)) {
> tasklet_unlock(t);
> return;
> }
> +#endif
> t->next = NULL;
> *head->tail = t;
> head->tail = &(t->next);
> @@ -1044,7 +1046,11 @@ static void tasklet_action_common(struct softirq_action *a,
> again:
> t->func(t->data);
>
> +#if !defined(CONFIG_SMP)
> + while (!tasklet_tryunlock(t)) {
> +#else
> while (cmpxchg(&t->state, TASKLET_STATEF_RC, 0) != TASKLET_STATEF_RC) {
> +#endif
This is still needed for RT && !SMP
> /*
> * If it got disabled meanwhile, bail out:
> */
Sebastian
