Re: [PATCH RFC] x86/entry: Ask RCU if it needs rcu_irq_{enter,exit}()

[Thomas Gleixner]

"Paul E. McKenney" <paulmck@xxxxxxxxxx> writes:
> +static __always_inline bool rcu_needs_irq_enter(void)
> +{
> +	return !IS_ENABLED(CONFIG_TINY_RCU) &&
> +               (context_tracking_enabled_cpu(smp_processor_id()) || is_idle_task(current));

This reintroduces the #PF problem which started the whole conditional
RCU entry discussion:

   https://lore.kernel.org/lkml/20200515235125.628629605@xxxxxxxxxxxxx/

and which made us all come to the conclusion that we can do it always
conditional. No biscuit for you. :)

Thanks,

        tglx