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From:   Arnd Bergmann <arnd@kernel.org>
Date:   Wed, 24 Feb 2021 09:38:29 +0100
Message-ID: <CAK8P3a1zfwJs3=mhvTGpLLak1Lqq6N-4N+zHrh-4KMRE75HP8w@mail.gmail.com>
Subject: Re: (.text.ks8851_probe_common+0x370): undefined reference to `__this_module'
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     kernel test robot <lkp@intel.com>, Marek Vasut <marex@denx.de>,
        Arnd Bergmann <arnd@arndb.de>, kbuild-all@lists.01.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andrew Lunn <andrew@lunn.ch>
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On Wed, Feb 24, 2021 at 3:38 AM Randy Dunlap <rdunlap@infradead.org> wrote:
>
> On 2/21/21 10:12 PM, kernel test robot wrote:
> > Hi Marek,
> >
> > FYI, the error/warning still remains.
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   31caf8b2a847214be856f843e251fc2ed2cd1075
> > commit: ef3631220d2b3d8d14cf64464760505baa60d6ac net: ks8851: Register MDIO bus and the internal PHY
> > date:   7 weeks ago
> > config: parisc-randconfig-r034-20210222 (attached as .config)
> > compiler: hppa-linux-gcc (GCC) 9.3.0
> > reproduce (this is a W=1 build):
> >          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >          chmod +x ~/bin/make.cross
> >          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef3631220d2b3d8d14cf64464760505baa60d6ac
> >          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >          git fetch --no-tags linus master
> >          git checkout ef3631220d2b3d8d14cf64464760505baa60d6ac
> >          # save the attached .config to linux build tree
> >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All errors (new ones prefixed by >>):
> >
> >     hppa-linux-ld: drivers/net/ethernet/micrel/ks8851_common.o: in function `ks8851_probe_common':
> >>> (.text.ks8851_probe_common+0x370): undefined reference to `__this_module'
> >>> hppa-linux-ld: (.text.ks8851_probe_common+0x374): undefined reference to `__this_module'
>
> Hey Arnd-
>
> I wanted to see if you had any ideas about this problem.
>
> CONFIG_KS8851=y
> CONFIG_KS8851_MLL=m
>
> The problem is that 2 drivers share some common code, but in one case
> the shared code is builtin and for the other driver it is a loadable
> module. The common code is first built as builtin, so it does not have
> the "__this_module" symbol.

This is the patch I sent for it:

https://lore.kernel.org/lkml/20210125121937.3900988-1-arnd@kernel.org/T/#u

        Arnd