tree: https://github.com/frank-w/BPI-R2-4.14 5.15-bpi-r2-pro-drm head: 16da2cf02e8cf795a7c5334a73478075c1448889 commit: ba6fb3823ee2cd11ea95cec9db41fc0053fe06b5 [98/101] fix vop_crtc_atomic_{enable,flush} config: x86_64-randconfig-a003-20211017 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 746dd6a700931988dd9021d3d04718f1929885a5) 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/frank-w/BPI-R2-4.14/commit/ba6fb3823ee2cd11ea95cec9db4... git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14 git fetch --no-tags frank-w-bpi-r2-4.14 5.15-bpi-r2-pro-drm git checkout ba6fb3823ee2cd11ea95cec9db41fc0053fe06b5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 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 >>): static const struct drm_bus_format_enum_list drm_bus_format_enum_list[] = { ^ drivers/gpu/drm/rockchip/rockchip_drm_vop.c:546:24: warning: unused function 'vop_read_lut' [-Wunused-function] static inline uint32_t vop_read_lut(struct vop *vop, uint32_t offset) ^ 2 warnings generated. vim +/drm_bus_format_enum_list +306 drivers/gpu/drm/rockchip/rockchip_drm_vop.c 671b538f2b304c Benjamin Gaignard 2021-05-17 305 671b538f2b304c Benjamin Gaignard 2021-05-17 @306 static const struct drm_bus_format_enum_list drm_bus_format_enum_list[] = { 671b538f2b304c Benjamin Gaignard 2021-05-17 307 { DRM_MODE_CONNECTOR_Unknown, "Unknown" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 308 { MEDIA_BUS_FMT_RGB565_1X16, "RGB565_1X16" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 309 { MEDIA_BUS_FMT_RGB666_1X18, "RGB666_1X18" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 310 { MEDIA_BUS_FMT_RGB666_1X24_CPADHI, "RGB666_1X24_CPADHI" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 311 { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, "RGB666_1X7X3_SPWG" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 312 { MEDIA_BUS_FMT_YUV8_1X24, "YUV8_1X24" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 313 { MEDIA_BUS_FMT_UYYVYY8_0_5X24, "UYYVYY8_0_5X24" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 314 { MEDIA_BUS_FMT_YUV10_1X30, "YUV10_1X30" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 315 { MEDIA_BUS_FMT_UYYVYY10_0_5X30, "UYYVYY10_0_5X30" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 316 { MEDIA_BUS_FMT_RGB888_1X24, "RGB888_1X24" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 317 { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, "RGB888_1X7X4_SPWG" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 318 { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, "RGB888_1X7X4_JEIDA" }, 671b538f2b304c Benjamin Gaignard 2021-05-17 319 }; 671b538f2b304c Benjamin Gaignard 2021-05-17 320 :::::: The code at line 306 was first introduced by commit :::::: 671b538f2b304cf24dbbbe25615bef2e86fef84d drm: forward port of VOP2 driver :::::: TO: Benjamin Gaignard <benjamin.gaignard(a)collabora.com&gt; :::::: CC: Frank Wunderlich <frank-w(a)public-files.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org