linux-kernel - Re: [PATCH v2 3/5] thermal: core: Remove old uapi generic netlink

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Message-ID: <CAP245DUG-OsSD-_CucMMQ26HpzjJhn0emfq_go923NsDq6RqOg@mail.gmail.com>
Date:   Wed, 1 Jul 2020 15:03:38 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Ram Chandrasekar <rkumbako@...eaurora.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] thermal: core: Remove old uapi generic netlink

On Wed, Jul 1, 2020 at 2:56 PM Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
> On 30/06/2020 13:47, Amit Kucheria wrote:
> > On Thu, Jun 25, 2020 at 8:15 PM Daniel Lezcano
> > <daniel.lezcano@...aro.org> wrote:
> >>
> >> In order to set the scene for the new generic netlink thermal
> >> management and notifications, let remove the old dead code remaining
> >
> > s/management/management api/
> >
> > s/let/let's/
> >
> >> in the uapi headers.
> >>
> >> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> >> ---
> >>  include/linux/thermal.h      |  5 -----
> >>  include/uapi/linux/thermal.h | 12 +-----------
> >>  2 files changed, 1 insertion(+), 16 deletions(-)
> >>
> >> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> >> index faf7ad031e42..fc93a6348082 100644
> >> --- a/include/linux/thermal.h
> >> +++ b/include/linux/thermal.h
> >> @@ -302,11 +302,6 @@ struct thermal_zone_params {
> >>         int offset;
> >>  };
> >>
> >> -struct thermal_genl_event {
> >> -       u32 orig;
> >> -       enum events event;
> >> -};
> >> -
> >>  /**
> >>   * struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
> >>   *
> >> diff --git a/include/uapi/linux/thermal.h b/include/uapi/linux/thermal.h
> >> index 96218378dda8..22df67ed9e9c 100644
> >> --- a/include/uapi/linux/thermal.h
> >> +++ b/include/uapi/linux/thermal.h
> >> @@ -6,21 +6,12 @@
> >>
> >>  /* Adding event notification support elements */
> >>  #define THERMAL_GENL_FAMILY_NAME                "thermal_event"
> >> -#define THERMAL_GENL_VERSION                    0x01
> >> +#define THERMAL_GENL_VERSION                    0x02
> >
> > This hunk should be removed since you set version back to 1 in the
> > next patch and we don't actually intend to bump the version yet.
>
> Well, I've been very strict here for git-bisecting.
>
> I move to V2 because of the removal, but when adding the new genetlink
> code, the family name changed, so we returned back to the V1 as it is a
> new genetlink thermal brand.

I don't understand the move to v2 for an empty skeleton UAPI. For the
purposes of bisection, couldn't you just remove all the v1 UAPI (w/o
bumping to v2) and then add a new UAPI in the next patch?

> The name is change because it is no longer event based but also sampling
> and commands.

In this case, just to avoid any confusion, the new UAPI could be v2
making the transition clear in case of bisection.

I'm afraid the v1->v2->v1 is a bit more confusing.

/Amit