Hi Guillaume,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linuxtv-media/master]
[also build test ERROR on v5.14-rc3 next-20210729]
[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/Guillaume-Tucker/media-vivid-drop-CONFIG_FB-dependency/20210729-191815
base:   git://linuxtv.org/media_tree.git master
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 10.3.0
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/51defc67cada10450046e4d4e7eda1a2573371cc
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Guillaume-Tucker/media-vivid-drop-CONFIG_FB-dependency/20210729-191815
        git checkout 51defc67cada10450046e4d4e7eda1a2573371cc
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=m68k 

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 >>, old ones prefixed by <<):

>> ERROR: modpost: "vivid_clear_fb" [drivers/media/test-drivers/vivid/vivid.ko] undefined!
>> ERROR: modpost: "vivid_fb_release_buffers" [drivers/media/test-drivers/vivid/vivid.ko] undefined!
>> ERROR: modpost: "vivid_fb_init" [drivers/media/test-drivers/vivid/vivid.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org