Re: [PATCH v2 06/18] auxdisplay: Extract character line display core support

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Hi Kernel Test Robot,

On Sat, Jun 26, 2021 at 1:36 AM kernel test robot <lkp@xxxxxxxxx> wrote:
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on robh/for-next]
> [also build test ERROR on staging/staging-testing linus/master v5.13-rc7 next-20210625]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url:    https://github.com/0day-ci/linux/commits/Geert-Uytterhoeven/auxdisplay-ht16k33-Add-character-display-support/20210625-210014
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
> config: powerpc-allmodconfig (attached as .config)
> compiler: powerpc64-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://github.com/0day-ci/linux/commit/5505aedee505055e2fe16a718203e24fd8519e2a
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Geert-Uytterhoeven/auxdisplay-ht16k33-Add-character-display-support/20210625-210014
>         git checkout 5505aedee505055e2fe16a718203e24fd8519e2a
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
> All errors (new ones prefixed by >>, old ones prefixed by <<):
>
> >> ERROR: modpost: ".kernfs_create_link" [drivers/auxdisplay/img-ascii-lcd.ko] undefined!

Thanks a lot!

This helped me finding compat_only_sysfs_link_entry_to_kobj(), which
I hadn't found before, and which does an even better job than my custom
sysfs_create_file_link() implementation.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds



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