tree: git://anongit.freedesktop.org/drm-intel drm-intel-gt-next head: 13c2ceb6addb6b14468e09b75832c98909eed8e7 commit: 88be9a0a06b73ecd85a688a7c174c941e9692e92 [2/8] drm/i915/ttm: add ttm_buddy_man config: x86_64-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): git remote add drm-intel git://anongit.freedesktop.org/drm-intel git fetch --no-tags drm-intel drm-intel-gt-next git checkout 88be9a0a06b73ecd85a688a7c174c941e9692e92 # save the attached .config to linux build tree make 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; Note: the drm-intel/drm-intel-gt-next HEAD bfde26df7af4e8ea894008dfda1d7d54a834dcd4 builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from drivers/gpu/drm/i915/i915_buddy.c:411: 777 | int i915_buddy_mock_selftests(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/i915_buddy_mock_selftests +777 drivers/gpu/drm/i915/selftests/i915_buddy.c 776 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org