linux-kernel - Re: [PATCH v3 2/8] thermal: core: Do not handle trip points with invalid temperature

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Date:   Tue, 1 Aug 2023 21:31:22 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Michal Wilczynski <michal.wilczynski@...el.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH v3 2/8] thermal: core: Do not handle trip points with
 invalid temperature

On 01/08/2023 21:05, Rafael J. Wysocki wrote:
> On Tue, Aug 1, 2023 at 8:29 PM Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>>
>> On 25/07/2023 14:06, Rafael J. Wysocki wrote:
>>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>>
>>> Trip points with temperature set to THERMAL_TEMP_INVALID are as good as
>>> disabled, so make handle_thermal_trip() ignore them.
>>>
>>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>> ---
>>>
>>> v2 -> v3: No changes.
>>>
>>> v1 -> v2: No changes.
>>>
>>> ---
>>>    drivers/thermal/thermal_core.c |    3 ++-
>>>    1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> Index: linux-pm/drivers/thermal/thermal_core.c
>>> ===================================================================
>>> --- linux-pm.orig/drivers/thermal/thermal_core.c
>>> +++ linux-pm/drivers/thermal/thermal_core.c
>>> @@ -348,7 +348,8 @@ static void handle_thermal_trip(struct t
>>>        struct thermal_trip trip;
>>>
>>>        /* Ignore disabled trip points */
>>> -     if (test_bit(trip_id, &tz->trips_disabled))
>>> +     if (test_bit(trip_id, &tz->trips_disabled) ||
>>> +         trip.temperature == THERMAL_TEMP_INVALID)
>>>                return;
>>
>> This will set the temperature to THERMAL_TEMP_INVALID at each thermal
>> zone update.
> 
> What do you mean?
> 
> It doesn't set anything.

Oh never mind, I read '=' not '=='

>> It would make more sense to set it when setting the disabled bit at init
>> time, no?
>>
>> But is that something we really want to do ? The trip point will be
>> reordered due to the temperature change (-273°C)
> 
> Again, I'm not sure what you mean.

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