Hi Moudy, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linuxtv-media/master] [also build test WARNING on robh/for-next mediatek/for-next v5.14-rc2 next-20210719] [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/Moudy-Ho/media-mediatek-support-... base: git://linuxtv.org/media_tree.git master config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 10.3.0 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/ca5b8c1fac55efa08e8362a4aa345c474... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Moudy-Ho/media-mediatek-support-mdp3-on-mt8183-platform/20210719-154845 git checkout ca5b8c1fac55efa08e8362a4aa345c474b798326 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arc 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 >>): drivers/media/platform/mtk-mdp3/mtk-mdp3-comp.c: In function 'mdp_sub_comps_create': 1232 | enum mdp_comp_type type = MDP_COMP_NONE; | ^~~~~~~~~~~~~ drivers/media/platform/mtk-mdp3/mtk-mdp3-comp.c: In function 'mdp_mm_init': drivers/media/platform/mtk-mdp3/mtk-mdp3-comp.c:1282:6: warning: unused variable 'ret' [-Wunused-variable] 1282 | int ret; | ^~~ vim +1232 drivers/media/platform/mtk-mdp3/mtk-mdp3-comp.c 1222 1223 static int mdp_sub_comps_create(struct mdp_dev *mdp, struct device_node *node) 1224 { 1225 struct device *dev = &mdp->pdev->dev; 1226 struct property *prop; 1227 const char *name; 1228 int index = 0; 1229 1230 of_property_for_each_string(node, "mdp3-comps", prop, name) { 1231 const struct of_device_id *matches = mdp_sub_comp_dt_ids; 1233 u32 alias_id; 1234 int id, ret; 1235 struct mdp_comp *comp; 1236 1237 for (; matches->compatible[0]; matches++) { 1238 if (of_compat_cmp(name, matches->compatible, 1239 strlen(matches->compatible)) == 0) { 1240 type = (enum mdp_comp_type)matches->data; 1241 break; 1242 } 1243 } 1244 1245 ret = of_property_read_u32_index(node, "mdp3-comp-ids", 1246 index, &alias_id); 1247 if (ret) { 1248 dev_warn(dev, "Skipping unknown component %s\n", name); 1249 return ret; 1250 } 1251 1252 id = mdp_comp_get_id(type, alias_id); 1253 if (id < 0) { 1254 dev_err(dev, "Failed to get component id: " 1255 "%s type %d, alias %d\n", name, type, alias_id); 1256 return -ENODEV; 1257 } 1258 1259 comp = mdp_comp_create(mdp, node, id); 1260 if (IS_ERR(comp)) 1261 return PTR_ERR(comp); 1262 1263 index++; 1264 } 1265 return 0; 1266 } 1267 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org