linux-kernel - Re: [PATCH v1 2/3] thermal/debugfs: Clean up thermal_debug_update

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Message-ID: <bf96cf30-3698-424d-8d6c-722514529005@arm.com>
Date: Mon, 22 Apr 2024 12:15:14 +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>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v1 2/3] thermal/debugfs: Clean up
 thermal_debug_update_temp()



On 4/17/24 14:10, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Notice that it is not necessary to compute tze in every iteration of the
> for () loop in thermal_debug_update_temp() because it is the same for all
> trips, so compute it once before the loop starts.
> 
> Also use a trip_stats local variable to make the code in that loop easier
> to follow and move the trip_id variable definition into that loop because
> it is not used elsewhere in the function.
> 
> While at it, change to order of local variable definitions in the function
> to follow the reverse-xmas-tree pattern.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>   drivers/thermal/thermal_debugfs.c |   21 +++++++++++----------
>   1 file changed, 11 insertions(+), 10 deletions(-)
> 
> Index: linux-pm/drivers/thermal/thermal_debugfs.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_debugfs.c
> +++ linux-pm/drivers/thermal/thermal_debugfs.c
> @@ -679,9 +679,9 @@ out:
>   void thermal_debug_update_temp(struct thermal_zone_device *tz)
>   {
>   	struct thermal_debugfs *thermal_dbg = tz->debugfs;
> -	struct tz_episode *tze;
>   	struct tz_debugfs *tz_dbg;
> -	int trip_id, i;
> +	struct tz_episode *tze;
> +	int i;
>   
>   	if (!thermal_dbg)
>   		return;
> @@ -693,15 +693,16 @@ void thermal_debug_update_temp(struct th
>   	if (!tz_dbg->nr_trips)
>   		goto out;
>   
> +	tze = list_first_entry(&tz_dbg->tz_episodes, struct tz_episode, node);
> +
>   	for (i = 0; i < tz_dbg->nr_trips; i++) {
> -		trip_id = tz_dbg->trips_crossed[i];
> -		tze = list_first_entry(&tz_dbg->tz_episodes, struct tz_episode, node);
> -		tze->trip_stats[trip_id].count++;
> -		tze->trip_stats[trip_id].max = max(tze->trip_stats[trip_id].max, tz->temperature);
> -		tze->trip_stats[trip_id].min = min(tze->trip_stats[trip_id].min, tz->temperature);
> -		tze->trip_stats[trip_id].avg = tze->trip_stats[trip_id].avg +
> -			(tz->temperature - tze->trip_stats[trip_id].avg) /
> -			tze->trip_stats[trip_id].count;
> +		int trip_id = tz_dbg->trips_crossed[i];
> +		struct trip_stats *trip_stats = &tze->trip_stats[trip_id];
> +
> +		trip_stats->max = max(trip_stats->max, tz->temperature);
> +		trip_stats->min = min(trip_stats->min, tz->temperature);
> +		trip_stats->avg += (tz->temperature - trip_stats->avg) /
> +					++trip_stats->count;
>   	}
>   out:
>   	mutex_unlock(&thermal_dbg->lock);
> 
> 
> 
> 

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