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

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Date:   Fri, 8 May 2020 12:10:32 +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 11:59 AM Grygorii Strashko
<grygorii.strashko@...com> wrote:
>
> From: Clay McClure <clay@...mons.net>
>
> My recent commit b6d49cab44b5 ("net: Make PTP-specific drivers depend on
> PTP_1588_CLOCK") exposes a missing dependency in defconfigs that select
> TI_CPTS without selecting PTP_1588_CLOCK, leading to linker errors of the
> form:
>
> drivers/net/ethernet/ti/cpsw.o: in function `cpsw_ndo_stop':
> cpsw.c:(.text+0x680): undefined reference to `cpts_unregister'
>  ...
>
> 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().

        Arnd