Hi Bagas, kernel test robot noticed the following build warnings: [auto build test WARNING on ac9a78681b921877518763ba0e89202254349d1b] url: https://github.com/intel-lab-lkp/linux/commits/Bagas-Sanjaya/agp-amd64-Remove-GPL-distribution-notice/20230511-214307 base: ac9a78681b921877518763ba0e89202254349d1b patch link: https://lore.kernel.org/r/20230511133406.78155-3-bagasdotme%40gmail.com patch subject: [PATCH 02/10] mISDN: Replace GPL notice boilerplate with SPDX identifier reproduce: scripts/spdxcheck.py If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202305121151.UPlaFk6c-lkp@xxxxxxxxx/ spdxcheck warnings: (new ones prefixed by >>) >> drivers/isdn/mISDN/dsp_audio.c: 1:28 Invalid License ID: GPL-1.0-or-later >> drivers/isdn/mISDN/dsp_blowfish.c: 1:28 Invalid License ID: GPL-1.0-or-later >> drivers/isdn/mISDN/dsp_cmx.c: 1:28 Invalid License ID: GPL-1.0-or-later >> drivers/isdn/mISDN/dsp_core.c: 1:28 Invalid License ID: GPL-1.0-or-later >> drivers/isdn/mISDN/dsp_dtmf.c: 1:28 Invalid License ID: GPL-1.0-or-later >> drivers/isdn/mISDN/dsp_tones.c: 1:28 Invalid License ID: GPL-1.0-or-later -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests