On Wed, Sep 21, 2016 at 05:58:27PM +0200, Petr Mladek wrote: > > +static inline void assert_clock_updated(struct rq *rq) > > +{ > > +#ifdef CONFIG_SCHED_DEBUG > > + /* > > + * The only reason for not seeing a clock update since the > > + * last rq_pin_lock() is if we're currently skipping updates. > > + */ > > + WARN_ON_ONCE(rq->clock_update_flags < RQCF_ACT_SKIP); > > +#endif > > +} > > I am afraid that it might eventually create a deadlock. > For example, there is the following call chain: >
Yeah, meh. There's already plenty WARNs in the sched code. The idea of course being that they should not trigger. If they do, something buggered already, so who bloody cares about a deadlock later ;-)