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

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Date:   Wed, 20 Sep 2023 11:54:48 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ido Schimmel <idosch@...dia.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        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 Wed, Sep 20, 2023 at 10:12 AM Ido Schimmel <idosch@...dia.com> wrote:
>
> 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").

That's correct.

> 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>

Thank you!