netdev - Re: [PATCH net-next V2] net: ks8851: Fix mixed module/builtin build

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Date:   Sat, 16 Jan 2021 20:26:22 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Marek Vasut <marex@...x.de>
Cc:     Networking <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
        Arnd Bergmann <arnd@...db.de>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Lukas Wunner <lukas@...ner.de>
Subject: Re: [PATCH net-next V2] net: ks8851: Fix mixed module/builtin build

On Sat, Jan 16, 2021 at 6:56 PM Marek Vasut <marex@...x.de> wrote:
> On 1/16/21 6:04 PM, Arnd Bergmann wrote:
> > On Sat, Jan 16, 2021 at 5:48 PM Marek Vasut <marex@...x.de> wrote:
>
> > I don't really like this version, as it does not actually solve the problem of
> > linking the same object file into both vmlinux and a loadable module, which
> > can have all kinds of side-effects besides that link failure you saw.
> >
> > If you want to avoid exporting all those symbols, a simpler hack would
> > be to '#include "ks8851_common.c" from each of the two files, which
> > then always duplicates the contents (even when both are built-in), but
> > at least builds the file the correct way.
>
> That's the same as V1, isn't it ?

Ah, I had not actually looked at the original submission, but yes, that
was slightly better than v2, provided you make all symbols static to
avoid the new link error.

I still think that having three modules and exporting the symbols from
the common part as Heiner Kallweit suggested would be the best
way to do it.

        Arnd