netdev - Re: [PATCH net v3] net: ethernet: ti: fix build and remove TI_CPTS

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Message-ID: <CAK8P3a0-6vRpHJugnUFhNNAALmqx4CUW9ffTOojxu5a80tAQTw@mail.gmail.com>
Date:   Fri, 8 May 2020 13:25:11 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Networking <netdev@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>,
        "David S. Miller" <davem@...emloft.net>,
        Russell King <linux@...linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Richard Cochran <richardcochran@...il.com>,
        Clay McClure <clay@...mons.net>, Dan Murphy <dmurphy@...com>,
        Murali Karicheri <m-karicheri2@...com>
Subject: Re: [PATCH net v3] net: ethernet: ti: fix build and remove
 TI_CPTS_MOD workaround

On Fri, May 8, 2020 at 1:14 PM Grygorii Strashko
<grygorii.strashko@...com> wrote:
> On 08/05/2020 13:10, Arnd Bergmann wrote:
> > On Fri, May 8, 2020 at 11:59 AM Grygorii Strashko

> >> That's because TI_CPTS_MOD (which is the symbol gating the _compilation_ of
> >> cpts.c) now depends on PTP_1588_CLOCK, and so is not enabled in these
> >> configurations, but TI_CPTS (which is the symbol gating _calls_ to the cpts
> >> functions) _is_ enabled. So we end up compiling calls to functions that
> >> don't exist, resulting in the linker errors.
> >>
> >> This patch fixes build errors and restores previous behavior by:
> >>   - ensure PTP_1588_CLOCK=y in TI specific configs and CPTS will be built
> >>   - use IS_REACHABLE(CONFIG_TI_CPTS) in code instead of IS_ENABLED()
> >
> > I don't understand what IS_REACHABLE() is needed for once all the other
> > changes are in place. I'd hope we can avoid that. Do you still see
> > failures without
> > that or is it just a precaution. I can do some randconfig testing on your patch
> > to see what else might be needed to avoid IS_REACHABLE().
>
> I've not changed this part of original patch, but seems you're right.
>
> I can drop it and resend, but, unfortunately, i do not have time today for full build testing.

I have applied to patch locally to my randconfig tree, with the IS_REACHABLE()
changes taken out.

> By the way in ptp_clock_kernel.h
> #if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)

This should also be changed I think, but it can wait for another day.

      Arnd