netdev - Re: [PATCH net-next v2] ethernet/intel: fix PTP_1588

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Message-ID: <CAK8P3a06enZOf=XyZ+zcAwBczv41UuCTz+=0FMf2gBz1_cOnZQ@mail.gmail.com>
Date:   Tue, 3 Aug 2021 20:27:14 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     "Keller, Jacob E" <jacob.e.keller@...el.com>
Cc:     Richard Cochran <richardcochran@...il.com>,
        Nicolas Pitre <nico@...xnic.net>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] ethernet/intel: fix PTP_1588_CLOCK dependencies

On Tue, Aug 3, 2021 at 7:19 PM Keller, Jacob E <jacob.e.keller@...el.com> wrote:
> > On Tue, Aug 3, 2021 at 6:14 PM Richard Cochran <richardcochran@...il.com> wrote:

> There is an alternative solution to fixing the imply keyword:
>
> Make the drivers use it properly by *actually* conditionally enabling the feature only when IS_REACHABLE, i.e. fix ice so that it uses IS_REACHABLE instead of IS_ENABLED, and so that its stub implementation in ice_ptp.h actually just silently does nothing but returns 0 to tell the rest of the driver things are fine.

I would consider IS_REACHABLE() part of the problem, not the solution, it makes
things magically build, but then surprises users at runtime when they do not get
the intended behavior.

      Arnd