Hi Matt, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-tip/drm-tip] [also build test WARNING on drm-exynos/exynos-drm-next drm/drm-next next-20220310] [cannot apply to drm-intel/for-linux-next tegra-drm/drm/tegra/for-next airlied/drm-next v5.17-rc7] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Matt-Roper/drm-i915-sseu-Don-t-overallocate-subslice-storage/20220311-141705 base: git://anongit.freedesktop.org/drm/drm-tip drm-tip config: i386-debian-10.3 (https://download.01.org/0day-ci/archive/20220311/202203112245.eDvNTHyE-lkp@xxxxxxxxx/config) compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/38985b2e6acdbe67dedb5de8a8aeef917b746453 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Matt-Roper/drm-i915-sseu-Don-t-overallocate-subslice-storage/20220311-141705 git checkout 38985b2e6acdbe67dedb5de8a8aeef917b746453 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/i915/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/i915/gt/intel_sseu.c:59:5: warning: no previous prototype for 'intel_sseu_get_geometry_subslices' [-Wmissing-prototypes] 59 | u32 intel_sseu_get_geometry_subslices(const struct sseu_dev_info *sseu) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/intel_sseu_get_geometry_subslices +59 drivers/gpu/drm/i915/gt/intel_sseu.c 58 > 59 u32 intel_sseu_get_geometry_subslices(const struct sseu_dev_info *sseu) 60 { 61 return _intel_sseu_get_subslices(sseu, sseu->geometry_subslice_mask, 0); 62 } 63 --- 0-DAY CI Kernel Test Service https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx