linux-kernel - Re: [PATCH v1 03/16] thermal: gov_bang_bang: Clean up thermal_zone_trip

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Date: Fri, 19 Apr 2024 10:41:27 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH v1 03/16] thermal: gov_bang_bang: Clean up
 thermal_zone_trip_update()



On 4/10/24 17:05, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Do the following cleanups in thermal_zone_trip_update():
> 
>   * Drop the useless "zero hysteresis" message.
>   * Eliminate the trip_index local variable that is redundant.
>   * Drop 2 comments that are not useful.
>   * Downgrade a diagnostic message from pr_warn() to pr_debug().
>   * Use consistent field formatting in diagnostic messages.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>   drivers/thermal/gov_bang_bang.c |   19 ++++++-------------
>   1 file changed, 6 insertions(+), 13 deletions(-)
> 
> Index: linux-pm/drivers/thermal/gov_bang_bang.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/gov_bang_bang.c
> +++ linux-pm/drivers/thermal/gov_bang_bang.c
> @@ -17,29 +17,23 @@ static void thermal_zone_trip_update(str
>   				     const struct thermal_trip *trip,
>   				     bool crossed_up)
>   {
> -	int trip_index = thermal_zone_trip_id(tz, trip);
>   	struct thermal_instance *instance;
>   
> -	if (!trip->hysteresis)
> -		dev_info_once(&tz->device,
> -			      "Zero hysteresis value for thermal zone %s\n", tz->type);
> -
>   	dev_dbg(&tz->device, "Trip%d[temp=%d]:temp=%d:hyst=%d\n",
> -				trip_index, trip->temperature, tz->temperature,
> -				trip->hysteresis);
> +		thermal_zone_trip_id(tz, trip), trip->temperature,
> +		tz->temperature, trip->hysteresis);
>   
>   	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
>   		if (instance->trip != trip)
>   			continue;
>   
> -		/* in case fan is in initial state, switch the fan off */
>   		if (instance->target == THERMAL_NO_TARGET)
>   			instance->target = 0;
>   
> -		/* in case fan is neither on nor off set the fan to active */
>   		if (instance->target != 0 && instance->target != 1) {
> -			pr_warn("Thermal instance %s controlled by bang-bang has unexpected state: %ld\n",
> -					instance->name, instance->target);
> +			pr_debug("Unexpected state %ld of thermal instance %s in bang-bang\n",
> +				 instance->target, instance->name);
> +
>   			instance->target = 1;
>   		}
>   
> @@ -52,8 +46,7 @@ static void thermal_zone_trip_update(str
>   		else if (instance->target == 1 && !crossed_up)
>   			instance->target = 0;
>   
> -		dev_dbg(&instance->cdev->device, "target=%d\n",
> -					(int)instance->target);
> +		dev_dbg(&instance->cdev->device, "target=%ld\n", instance->target);
>   
>   		mutex_lock(&instance->cdev->lock);
>   		instance->cdev->updated = false; /* cdev needs update */
> 
> 
> 

LGTM

Reviewed-by: Lukasz Luba <lukasz.luba@....com>