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

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Date:   Sat, 16 Jan 2021 18:54:21 +0100
From:   Marek Vasut <marex@...x.de>
To:     Arnd Bergmann <arnd@...nel.org>
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 1/16/21 6:04 PM, Arnd Bergmann wrote:
> On Sat, Jan 16, 2021 at 5:48 PM Marek Vasut <marex@...x.de> wrote:
>>
>> When either the SPI or PAR variant is compiled as module AND the other
>> variant is compiled as built-in, the following build error occurs:
>>
>> arm-linux-gnueabi-ld: drivers/net/ethernet/micrel/ks8851_common.o: in function `ks8851_probe_common':
>> ks8851_common.c:(.text+0x1564): undefined reference to `__this_module'
>>
>> Fix this by passing THIS_MODULE as argument to ks8851_probe_common(),
>> ks8851_register_mdiobus(), and ultimately __mdiobus_register() in the
>> ks8851_common.c.
>>
>> Fixes: ef3631220d2b ("net: ks8851: Register MDIO bus and the internal PHY")
>> Signed-off-by: Marek Vasut <marex@...x.de>
>> Cc: Andrew Lunn <andrew@...n.ch>
>> Cc: Arnd Bergmann <arnd@...db.de>
>> Cc: Heiner Kallweit <hkallweit1@...il.com>
>> Cc: Jakub Kicinski <kuba@...nel.org>
>> Cc: Lukas Wunner <lukas@...ner.de>
> 
> 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 ?