tree: git://github.com/linux-chenxing/linux.git msc313_mainlining head: 3b75af2a2f0d6aea3abc4cf56690ae7a6fd2dac6 commit: 0d8434e20c2d30bac37d042462ba57649e33a786 [47/76] pinctrl header names config: arm-randconfig-r012-20211213 (https://download.01.org/0day-ci/archive/20211214/202112140343.VO0Mdyih-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a2ddb6c8ac29412b1361810972e15221fa021c) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/linux-chenxing/linux/commit/0d8434e20c2d30bac37d042462... git remote add chenxing git://github.com/linux-chenxing/linux.git git fetch --no-tags chenxing msc313_mainlining git checkout 0d8434e20c2d30bac37d042462ba57649e33a786 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/pinctrl/mstar/ 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 >>): default: ^ drivers/pinctrl/mstar/pinctrl-msc313.c:1339:4: note: insert 'break;' to avoid fall-through default: ^ break; static const unsigned int sd_drivestrengths[] = {4, 8}; ^ static const unsigned int spi0_drivestrengths[] = {4, 8, 12, 16}; ^ static const unsigned int i2c_drivestrengths[] = {4, 8}; ^ static const unsigned int sr_drivestrengths[] = {4, 8}; ^ 5 warnings generated. vim +1339 drivers/pinctrl/mstar/pinctrl-msc313.c 4e180cab5755b5 Daniel Palmer 2020-12-07 1318 4e180cab5755b5 Daniel Palmer 2020-12-07 1319 static int mstar_set_config(struct msc313_pinctrl *pinctrl, int pin, unsigned long config) 4e180cab5755b5 Daniel Palmer 2020-12-07 1320 { 4e180cab5755b5 Daniel Palmer 2020-12-07 1321 enum pin_config_param param = pinconf_to_config_param(config); 4e180cab5755b5 Daniel Palmer 2020-12-07 1322 u32 arg = pinconf_to_config_argument(config); 4e180cab5755b5 Daniel Palmer 2020-12-07 1323 int i; 4e180cab5755b5 Daniel Palmer 2020-12-07 1324 unsigned int mask; 4e180cab5755b5 Daniel Palmer 2020-12-07 1325 const struct msc313_pinctrl_pinconf *confpin; 4e180cab5755b5 Daniel Palmer 2020-12-07 1326 4e180cab5755b5 Daniel Palmer 2020-12-07 1327 dev_dbg(pinctrl->dev, "setting %d:%u on pin %d\n", (int)config, (unsigned int)arg, pin); 4e180cab5755b5 Daniel Palmer 2020-12-07 1328 for (i = 0; i < pinctrl->info->npinconfs; i++) { 4e180cab5755b5 Daniel Palmer 2020-12-07 1329 if (pinctrl->info->pinconfs[i].pin == pin) { 4e180cab5755b5 Daniel Palmer 2020-12-07 1330 confpin = &pinctrl->info->pinconfs[i]; 4e180cab5755b5 Daniel Palmer 2020-12-07 1331 switch (param) { 4e180cab5755b5 Daniel Palmer 2020-12-07 1332 case PIN_CONFIG_BIAS_PULL_UP: 4e180cab5755b5 Daniel Palmer 2020-12-07 1333 if (confpin->pull_en_reg != -1) { 4e180cab5755b5 Daniel Palmer 2020-12-07 1334 dev_dbg(pinctrl->dev, "setting pull up %d on pin %d\n", (int) arg, pin); 4e180cab5755b5 Daniel Palmer 2020-12-07 1335 mask = 1 << confpin->pull_en_bit; 4e180cab5755b5 Daniel Palmer 2020-12-07 1336 regmap_update_bits(pinctrl->regmap, confpin->pull_en_reg, mask, arg ? mask : 0); 4e180cab5755b5 Daniel Palmer 2020-12-07 1337 } else 4e180cab5755b5 Daniel Palmer 2020-12-07 1338 dev_info(pinctrl->dev, "pullup reg/bit isn't known for pin %d\n", pin); 4e180cab5755b5 Daniel Palmer 2020-12-07 @1339 default: 4e180cab5755b5 Daniel Palmer 2020-12-07 1340 break; 4e180cab5755b5 Daniel Palmer 2020-12-07 1341 } 4e180cab5755b5 Daniel Palmer 2020-12-07 1342 return 0; 4e180cab5755b5 Daniel Palmer 2020-12-07 1343 } 4e180cab5755b5 Daniel Palmer 2020-12-07 1344 } 4e180cab5755b5 Daniel Palmer 2020-12-07 1345 return 0; 4e180cab5755b5 Daniel Palmer 2020-12-07 1346 } 4e180cab5755b5 Daniel Palmer 2020-12-07 1347 :::::: The code at line 1339 was first introduced by commit :::::: 4e180cab5755b5116ca4fb151ce6068ff5442e70 pinctrl: mstar: msc313 pinctrl driver :::::: TO: Daniel Palmer <daniel(a)0x0f.com&gt; :::::: CC: Daniel Palmer <daniel(a)0x0f.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org