Hi Imre, kernel test robot noticed the following build errors: [auto build test ERROR on drm-tip/drm-tip] url: https://github.com/intel-lab-lkp/linux/commits/Imre-Deak/drm-dp_mst-Fix-fractional-DSC-bpp-handling/20231024-091920 base: git://anongit.freedesktop.org/drm/drm-tip drm-tip patch link: https://lore.kernel.org/r/20231024010925.3949910-9-imre.deak%40intel.com patch subject: [PATCH 08/29] drm/dp: Add helpers to calculate the link BW overhead config: x86_64-buildonly-randconfig-003-20231024 (https://download.01.org/0day-ci/archive/20231024/202310242019.Hp2KseM1-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-12) 11.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231024/202310242019.Hp2KseM1-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202310242019.Hp2KseM1-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): ld: drivers/gpu/drm/display/drm_dp_mst_topology.o: in function `drm_dp_calc_pbn_mode': >> drm_dp_mst_topology.c:(.text+0x1403): undefined reference to `drm_dp_bw_overhead' -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
