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Re: [PATCH 14/36] cpuidle: Fix rcu_idle_*() usage
- To: Mark Rutland <mark.rutland@xxxxxxx>
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Tue, 14 Jun 2022 18:40:53 +0200
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- Delivery-date: Wed, 15 Jun 2022 04:05:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Jun 14, 2022 at 01:41:13PM +0100, Mark Rutland wrote:
> On Wed, Jun 08, 2022 at 04:27:37PM +0200, Peter Zijlstra wrote:
> > --- a/kernel/time/tick-broadcast.c
> > +++ b/kernel/time/tick-broadcast.c
> > @@ -622,9 +622,13 @@ struct cpumask *tick_get_broadcast_onesh
> > * to avoid a deep idle transition as we are about to get the
> > * broadcast IPI right away.
> > */
> > -int tick_check_broadcast_expired(void)
> > +noinstr int tick_check_broadcast_expired(void)
> > {
> > +#ifdef _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H
> > + return arch_test_bit(smp_processor_id(),
> > cpumask_bits(tick_broadcast_force_mask));
> > +#else
> > return cpumask_test_cpu(smp_processor_id(), tick_broadcast_force_mask);
> > +#endif
> > }
>
> This is somewhat not-ideal. :/
I'll say.
> Could we unconditionally do the arch_test_bit() variant, with a comment, or
> does that not exist in some cases?
Loads of build errors ensued, which is how I ended up with this mess ...
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