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

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Date:   Wed, 6 Jul 2022 14:07:33 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, 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 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


>   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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