linux-kernel - Re: [PATCH 1/2] thermal/core: Use clamp() helper in the stepwise governor

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Message-ID: <CAJZ5v0jPdo5=YWS_ZjLDojtXkpxqejzircN+fGG9y1pnCyH_qg@mail.gmail.com>
Date:   Wed, 6 Jul 2022 14:26:42 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH 1/2] thermal/core: Use clamp() helper in the stepwise governor

On Wed, Jul 6, 2022 at 2:07 PM Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
> On 29/06/2022 17:10, Daniel Lezcano wrote:
> > The code is actually clampling the next cooling device state using the
> > lowest and highest states of the thermal instance.
> >
> > That code can be replaced by the clamp() macro which does exactly the
> > same. It results in a simpler routine to read.
> >
> > Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> > ---
>
> I'll apply this series if nobody has comments

Sounds good to me.

Please feel free to add ACKs from me to the patches.

>
> >   drivers/thermal/gov_step_wise.c | 15 ++++-----------
> >   1 file changed, 4 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/thermal/gov_step_wise.c b/drivers/thermal/gov_step_wise.c
> > index 12acb12aac50..6efbfaf014da 100644
> > --- a/drivers/thermal/gov_step_wise.c
> > +++ b/drivers/thermal/gov_step_wise.c
> > @@ -11,6 +11,7 @@
> >    */
> >
> >   #include <linux/thermal.h>
> > +#include <linux/minmax.h>
> >   #include <trace/events/thermal.h>
> >
> >   #include "thermal_core.h"
> > @@ -52,10 +53,7 @@ static unsigned long get_target_state(struct thermal_instance *instance,
> >
> >       if (!instance->initialized) {
> >               if (throttle) {
> > -                     next_target = (cur_state + 1) >= instance->upper ?
> > -                                     instance->upper :
> > -                                     ((cur_state + 1) < instance->lower ?
> > -                                     instance->lower : (cur_state + 1));
> > +                     next_target = clamp((cur_state + 1), instance->lower, instance->upper);
> >               } else {
> >                       next_target = THERMAL_NO_TARGET;
> >               }
> > @@ -66,10 +64,7 @@ static unsigned long get_target_state(struct thermal_instance *instance,
> >       switch (trend) {
> >       case THERMAL_TREND_RAISING:
> >               if (throttle) {
> > -                     next_target = cur_state < instance->upper ?
> > -                                 (cur_state + 1) : instance->upper;
> > -                     if (next_target < instance->lower)
> > -                             next_target = instance->lower;
> > +                     next_target = clamp((cur_state + 1), instance->lower, instance->upper);
> >               }
> >               break;
> >       case THERMAL_TREND_RAISE_FULL:
> > @@ -82,9 +77,7 @@ static unsigned long get_target_state(struct thermal_instance *instance,
> >                               next_target = THERMAL_NO_TARGET;
> >               } else {
> >                       if (!throttle) {
> > -                             next_target = cur_state - 1;
> > -                             if (next_target > instance->upper)
> > -                                     next_target = instance->upper;
> > +                             next_target = clamp((cur_state - 1), instance->lower, instance->upper);
> >                       }
> >               }
> >               break;
>
>
> --
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