linux-kernel - Re: [PATCH v1 1/6] thermal: trip: Simplify computing trip indices

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Date:   Thu, 12 Oct 2023 18:21:08 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
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>,
        Lukasz Luba <lukasz.luba@....com>
Subject: Re: [PATCH v1 1/6] thermal: trip: Simplify computing trip indices

On Thu, Oct 12, 2023 at 4:27 PM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
> On 06/10/2023 19:40, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > A trip index can be computed right away as a difference between the
> > value of a trip pointer pointing to the given trip object and the
> > start of the trips[] table in the thermal zone containing the trip, so
> > change thermal_zone_trip_id() accordingly.
> >
> > No intentional functional impact (except for some speedup).
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> >   drivers/thermal/thermal_trip.c |   13 +++++--------
> >   1 file changed, 5 insertions(+), 8 deletions(-)
> >
> > Index: linux-pm/drivers/thermal/thermal_trip.c
> > ===================================================================
> > --- linux-pm.orig/drivers/thermal/thermal_trip.c
> > +++ linux-pm/drivers/thermal/thermal_trip.c
> > @@ -175,14 +175,11 @@ int thermal_zone_set_trip(struct thermal
> >   int thermal_zone_trip_id(struct thermal_zone_device *tz,
> >                        const struct thermal_trip *trip)
> >   {
> > -     int i;
> > -
> >       lockdep_assert_held(&tz->lock);
> >
> > -     for (i = 0; i < tz->num_trips; i++) {
> > -             if (&tz->trips[i] == trip)
> > -                     return i;
> > -     }
> > -
> > -     return -ENODATA;
> > +     /*
> > +      * Assume the trip to be located within the bounds of the thermal
> > +      * zone's trips[] table.
> > +      */
> > +     return trip - tz->trips;
>
> Shouldn't be divided by sizeof(*trip) ?

No, it's in sizeof(*trip) units already.