linux-kernel - Re: [PATCH v3 6/6] thermal: core: Relocate critical and hot trip handling

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Date: Thu, 4 Apr 2024 11:03:30 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, 
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, 
	Daniel Lezcano <daniel.lezcano@...aro.org>, Lukasz Luba <lukasz.luba@....com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v3 6/6] thermal: core: Relocate critical and hot trip handling

On Tue, Apr 2, 2024 at 9:04 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Modify handle_thermal_trip() to call handle_critical_trips() only after
> finding that the trip temperature has been crossed on the way up and
> remove the redundant temperature check from the latter.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

This change is premature, as it will cause handle_non_critical_trips()
to be called for hot/critical trips which is questionable, so I'm
withdrawing it for now.

The rest of the series is still applicable, though.


> ---
>  drivers/thermal/thermal_core.c |   15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
>
> Index: linux-pm/drivers/thermal/thermal_core.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_core.c
> +++ linux-pm/drivers/thermal/thermal_core.c
> @@ -349,10 +349,6 @@ void thermal_zone_device_critical_reboot
>  static void handle_critical_trips(struct thermal_zone_device *tz,
>                                   const struct thermal_trip *trip)
>  {
> -       /* If we have not crossed the trip_temp, we do not care. */
> -       if (trip->temperature <= 0 || tz->temperature < trip->temperature)
> -               return;
> -
>         trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, trip), trip->type);
>
>         if (trip->type == THERMAL_TRIP_CRITICAL)
> @@ -404,12 +400,15 @@ static void handle_thermal_trip(struct t
>                 list_add_tail(&td->notify_list_node, way_up_list);
>                 td->notify_temp = trip->temperature;
>                 td->threshold -= trip->hysteresis;
> +
> +               if (trip->type == THERMAL_TRIP_CRITICAL ||
> +                   trip->type == THERMAL_TRIP_HOT) {
> +                       handle_critical_trips(tz, trip);
> +                       return;
> +               }
>         }
>
> -       if (trip->type == THERMAL_TRIP_CRITICAL || trip->type == THERMAL_TRIP_HOT)
> -               handle_critical_trips(tz, trip);
> -       else
> -               handle_non_critical_trips(tz, trip);
> +       handle_non_critical_trips(tz, trip);
>  }
>
>  static void update_temperature(struct thermal_zone_device *tz)
>
>
>
>