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SubjectRe: [RFC PATCH 1/3] lockdep/irq: Be more strict about IRQ-threadable code end
On Mon, Mar 23, 2020 at 02:53:20PM +0100, Peter Zijlstra wrote:
> On Mon, Mar 23, 2020 at 04:32:05AM +0100, Frederic Weisbecker wrote:
> > --- a/kernel/irq/handle.c
> > +++ b/kernel/irq/handle.c
> > @@ -144,18 +144,24 @@ irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags
> >
> > for_each_action_of_desc(desc, action) {
> > irqreturn_t res;
> > + bool threadable;
> >
> > /*
> > * If this IRQ would be threaded under force_irqthreads, mark it so.
> > */
> > - if (irq_settings_can_thread(desc) &&
> > - !(action->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)))
> > + threadable = (irq_settings_can_thread(desc) &&
> > + !(action->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)));
> > +
> > + if (threadable)
> > trace_hardirq_threaded();
> >
> > trace_irq_handler_entry(irq, action);
> > res = action->handler(irq, action->dev_id);
> > trace_irq_handler_exit(irq, action, res);
> >
> > + if (threadable)
> > + trace_hardirq_unthreaded();
>
> AFAICT this doesn't work for nested IRQ handlers.

So current->hardirq_threaded should be a counter perhaps?

>
> > if (WARN_ONCE(!irqs_disabled(),"irq %u handler %pS enabled interrupts\n",
> > irq, action->handler))
> > local_irq_disable();
> > --
> > 2.25.0
> >

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