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Date:   Tue, 3 Aug 2021 23:25:42 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     Arnd Bergmann <arnd@...nel.org>
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



> -----Original Message-----
> From: Arnd Bergmann <arnd@...nel.org>
> Sent: Tuesday, August 03, 2021 11:27 AM
> 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; netdev@...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

Fair enough. I am also fine with just "depends". We can make most of the drivers simply always enable it, and if a specific driver is used in some embedded setup that has requirements on minimizing things that driver can be setup to use a 2nd config symbol, and all of the other drivers that aren't used can be disabled (as that minimizer is probably already doing!)

I think we've found the best route to go then!

Thanks,
Jake

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