tree: https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git mediatek-drm-decouple-sub-driver head: 01742c252181ef443e1f3fa3cce22e351eaa0c10 commit: 9bc998c4daa0b83fd7c59cc5f5529c3a26bcfd50 [25/27] drm/mediatek: Register vblank callback function config: arm64-allyesconfig (attached as .config) compiler: aarch64-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/chunkuang.hu/linux.git/co... git remote add chunkuang.hu https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git git fetch --no-tags chunkuang.hu mediatek-drm-decouple-sub-driver git checkout 9bc998c4daa0b83fd7c59cc5f5529c3a26bcfd50 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 475 | void mtk_crtc_ddp_irq(void *data) | ^~~~~~~~~~~~~~~~ vim +/mtk_crtc_ddp_irq +475 drivers/gpu/drm/mediatek/mtk_drm_crtc.c 474 476 { 477 struct drm_crtc *crtc = data; 478 struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); 479 struct mtk_drm_private *priv = crtc->dev->dev_private; 480 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org