Hi luo, Thank you for the patch! Yet something to improve: [auto build test ERROR on next-20211015] url: https://github.com/0day-ci/linux/commits/luo-penghao/drm-i915-display-Rem... base: 7c832d2f9b959e3181370c8b0dacaf9efe13fc05 config: x86_64-randconfig-r014-20211018 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d245f2e8597bfb52c34810a328d42b990e4af1a4) 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/0day-ci/linux/commit/1a3c67fc7e245a1130e2b59fe5a04ce82... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review luo-penghao/drm-i915-display-Remove-unused-variable-in-the-for-loop/20211018-164557 git checkout 1a3c67fc7e245a1130e2b59fe5a04ce82de697c0 # 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 errors (new ones prefixed by >>): fb->base.format->cpp[i]; ~~~~~~~~~~~~~~~~~~~~ ~^ 1 error generated. vim +1018 drivers/gpu/drm/i915/display/intel_fb.c 977 978 int intel_fill_fb_info(struct drm_i915_private *i915, struct intel_framebuffer *fb) 979 { 980 struct drm_i915_gem_object *obj = intel_fb_obj(&fb->base); 981 u32 gtt_offset_rotated = 0; 982 u32 gtt_offset_remapped = 0; 983 unsigned int max_size = 0; 984 int i, num_planes = fb->base.format->num_planes; 985 unsigned int tile_size = intel_tile_size(i915); 986 987 intel_fb_view_init(i915, &fb->normal_view, I915_GGTT_VIEW_NORMAL); 988 989 drm_WARN_ON(&i915->drm, 990 intel_fb_supports_90_270_rotation(fb) && 991 intel_fb_needs_pot_stride_remap(fb)); 992 993 if (intel_fb_supports_90_270_rotation(fb)) 994 intel_fb_view_init(i915, &fb->rotated_view, I915_GGTT_VIEW_ROTATED); 995 if (intel_fb_needs_pot_stride_remap(fb)) 996 intel_fb_view_init(i915, &fb->remapped_view, I915_GGTT_VIEW_REMAPPED); 997 998 for (i = 0; i < num_planes; i++) { 999 struct fb_plane_view_dims view_dims; 1000 unsigned int width, height; 1001 unsigned int size; 1002 u32 offset; 1003 int x, y; 1004 int ret; 1005 1006 /* 1007 * Plane 2 of Render Compression with Clear Color fb modifier 1008 * is consumed by the driver and not passed to DE. Skip the 1009 * arithmetic related to alignment and offset calculation. 1010 */ 1011 if (is_gen12_ccs_cc_plane(&fb->base, i)) { 1012 if (IS_ALIGNED(fb->base.offsets[i], PAGE_SIZE)) 1013 continue; 1014 else 1015 return -EINVAL; 1016 } 1017 1019 intel_fb_plane_dims(fb, i, &width, &height); 1020 1021 ret = convert_plane_offset_to_xy(fb, i, width, &x, &y); 1022 if (ret) 1023 return ret; 1024 1025 init_plane_view_dims(fb, i, width, height, &view_dims); 1026 1027 /* 1028 * First pixel of the framebuffer from 1029 * the start of the normal gtt mapping. 1030 */ 1031 fb->normal_view.color_plane[i].x = x; 1032 fb->normal_view.color_plane[i].y = y; 1033 fb->normal_view.color_plane[i].stride = fb->base.pitches[i]; 1034 1035 offset = calc_plane_aligned_offset(fb, i, &x, &y); 1036 1037 if (intel_fb_supports_90_270_rotation(fb)) 1038 gtt_offset_rotated += calc_plane_remap_info(fb, i, &view_dims, 1039 offset, gtt_offset_rotated, x, y, 1040 &fb->rotated_view); 1041 1042 if (intel_fb_needs_pot_stride_remap(fb)) 1043 gtt_offset_remapped += calc_plane_remap_info(fb, i, &view_dims, 1044 offset, gtt_offset_remapped, x, y, 1045 &fb->remapped_view); 1046 1047 size = calc_plane_normal_size(fb, i, &view_dims, x, y); 1048 /* how many tiles in total needed in the bo */ 1049 max_size = max(max_size, offset + size); 1050 } 1051 1052 if (mul_u32_u32(max_size, tile_size) > obj->base.size) { 1053 drm_dbg_kms(&i915->drm, 1054 "fb too big for bo (need %llu bytes, have %zu bytes)\n", 1055 mul_u32_u32(max_size, tile_size), obj->base.size); 1056 return -EINVAL; 1057 } 1058 1059 return 0; 1060 } 1061 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org