Re: [RFC PATCH v4 6/8] intel_idle: Provide enter_dead() handler for SRF

[Peter Zijlstra <peterz@infradead.org>]

On Mon, Nov 25, 2024 at 02:58:50PM +0100, Rafael J. Wysocki wrote:

> > @@ -2143,10 +2143,15 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
> >                 if (intel_idle_max_cstate_reached(cstate))
> >                         break;
> >
> > -               if (!cpuidle_state_table[cstate].enter &&
> > -                   !cpuidle_state_table[cstate].enter_s2idle)
> > +               if (!cpuidle_state_table[cstate].enter)
> >                         break;
> >
> > +               if (!cpuidle_state_table[cstate].enter_dead)
> > +                       cpuidle_state_table[cstate].enter_dead = intel_idle_enter_dead;
> > +
> > +               if (!cpuidle_state_table[cstate].enter_s2idle)
> > +                       cpuidle_state_table[cstate].enter_s2idle = intel_idle_s2idle;
> > +
> >                 /* If marked as unusable, skip this state. */
> >                 if (cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_UNUSABLE) {
> >                         pr_debug("state %s is disabled\n",
> 
> You can do the same thing with :enter() I think?  And it doesn't need
> to be in one go.

!enter is used as a terminator.

And it's harder to not do everything in one go; regex ftw :-)