linux-kernel - Re: [PATCH v1] thermal: core: Drop trips

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Date:   Wed, 20 Sep 2023 11:12:29 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v1] thermal: core: Drop trips_disabled bitmask

On Tue, Sep 19, 2023 at 08:54:37PM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> After recent changes, thermal_zone_get_trip() cannot fail, as invoked
> from thermal_zone_device_register_with_trips(), so the only role of
> the trips_disabled bitmask is struct thermal_zone_device is to make
> handle_thermal_trip() skip trip points whose temperature was initially
> zero.  However, since the unit of temperature in the thermal core is
> millicelsius, zero may very well be a valid temperature value at least
> in some usage scenarios and the trip temperature may as well change
> later.  Thus there is no reason to permanently disable trip points
> with initial temperature equal to zero.
> 
> Accordingly, drop the trips_disabled bitmask along with the code
> related to it.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

I guess I was copied because of commit f1b80a3878b2 ("thermal: core:
Restore behavior regarding invalid trip points"). Since then we stopped
relying on this behavior with commit 5601ef91fba8 ("mlxsw: core_thermal:
Use static trip points for transceiver modules").

Tested your patch and didn't see any regressions:

Tested-by: Ido Schimmel <idosch@...dia.com>

Thanks