tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.10 head: 8a61a624cf9943a61be32df1244840633bba5de6 commit: 6dfa95dc6916d7e6a872fe931ce9e985170f5748 [17195/17338] UPSTREAM: drm/hyperv: Add DRM driver for hyperv synthetic video device config: x86_64-randconfig-a015-20210722 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9625ca5b602616b2f5584e8a49ba93c52c141e40) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-5.10 git checkout 6dfa95dc6916d7e6a872fe931ce9e985170f5748 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 uint64_t hyperv_modifiers[] = { ^ 1 warning generated. vim +/hyperv_modifiers +152 drivers/gpu/drm/hyperv/hyperv_drm_modeset.c 151 153 DRM_FORMAT_MOD_LINEAR, 154 DRM_FORMAT_MOD_INVALID 155 }; 156 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org