On Sun, 12 Feb 2017, Chris Wilson wrote:
> On Sun, Feb 12, 2017 at 03:46:09PM +, Chris Wilson wrote:
> > +void tasklet_enable(struct tasklet_struct *t)
> > +{
> > + if (!atomic_dec_and_test(&t->count))
> > + return;
> > +
> > + if (test_bit(TASKLET_STATE_SCHED, &t->state))
> > +
On Sun, Feb 12, 2017 at 03:46:09PM +, Chris Wilson wrote:
> +void tasklet_enable(struct tasklet_struct *t)
> +{
> + if (!atomic_dec_and_test(&t->count))
> + return;
> +
> + if (test_bit(TASKLET_STATE_SCHED, &t->state))
> + raise_softirq(HI_SOFTIRQ | TASKLET_SOFTI
Disabling a tasklet causes it not to run during tasklet_action, but is
put back onto the runnable tasklet list, and a new softirq raised. As
the softirq is raised from within __do_softirq() this causing
__do_softirq() to loop constantly until its timeslice expires and is
transferred to the ksoftirq
