linux-kernel - Re: [PATCH v3 0/8] ACPI: thermal: Use trip point table to register thermal zones

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Message-ID: <728e22ab-f68c-a891-f4d0-3d66cd03e9ec@linaro.org>
Date:   Tue, 1 Aug 2023 20:26:37 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     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 0/8] ACPI: thermal: Use trip point table to register
 thermal zones


Hi Rafael,

On 25/07/2023 14:02, Rafael J. Wysocki wrote:
> Hi Everyone,
> 
> This is the second iteration of the $subject patch series and its original
> description below is still applicable
> 
> On Tuesday, July 18, 2023 8:01:20 PM CEST Rafael J. Wysocki wrote:
>>
>> This patch series makes the ACPI thermal driver register thermal zones
>> with the help of thermal_zone_device_register_with_trips(), so it
>> doesn't need to use the thermal zone callbacks related to trip points
>> any more (and they are dropped in the last patch).
>>
>> The approach presented here is quite radically different from the
>> previous attempts, as it doesn't really rearrange the driver's
>> internal data structures, but adds the trip table support on top of
>> them.  For this purpose, it uses an additional field in struct thermal_trip
>> introduced in the first patch.
> 
> This update is mostly related to the observation that the critical and hot trip
> points never change after initialization, so they don't really need to be
> connected back to the corresponding thermal_trip structures.  It also fixes
> an error code path memory leak in patch [5/8].

I've been through the series. It is really cool that we can get rid of 
the ops usage at the end of the series.

However, the series introduces a wrapper to the thermal zone lock and 
exports that in the public header. That goes in the opposite direction 
of the recent cleanups and obviously will give the opportunity to 
drivers to do silly things [again].

On the other side, the structure thermal_trip introduces a circular 
reference, which is usually something to avoid.

Apart those two points, the ACPI changes look ok.

Comments in the different patches will follow

Thanks

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