Hi "Marek, Thank you for the patch! Yet something to improve: [auto build test ERROR on net/master] [also build test ERROR on next-20210413] [cannot apply to net-next/master ipvs/master linus/master v5.12-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/Marek-Beh-n/net-phy-marvell-some... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git ccb39c6285581992f0225c45e4de704028a8ec17 config: x86_64-randconfig-a011-20210413 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9829f5e6b1bca9b61efc629770d28bb9014dec45) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/594b70c48fa643c6864722ab488bbfba0... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Marek-Beh-n/net-phy-marvell-some-HWMON-updates/20210413-155751 git checkout 594b70c48fa643c6864722ab488bbfba0b210852 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>): fallthrough; ^ include/linux/compiler_attributes.h:208:41: note: expanded from macro 'fallthrough' # define fallthrough __attribute__((__fallthrough__)) ^ 1 error generated. vim +2416 drivers/net/phy/marvell.c 2394 2395 static int marvell_hwmon_read(struct device *dev, enum hwmon_sensor_types type, 2396 u32 attr, int channel, long *temp) 2397 { 2398 struct phy_device *phydev = dev_get_drvdata(dev); 2399 const struct marvell_hwmon_ops *ops = to_marvell_hwmon_ops(phydev); 2400 int err = -EOPNOTSUPP; 2401 2402 switch (attr) { 2403 case hwmon_temp_input: 2404 if (ops->get_temp) 2405 err = ops->get_temp(phydev, temp); 2406 break; 2407 case hwmon_temp_crit: 2408 if (ops->get_temp_critical) 2409 err = ops->get_temp_critical(phydev, temp); 2410 break; 2411 case hwmon_temp_max_alarm: 2412 if (ops->get_temp_alarm) 2413 err = ops->get_temp_alarm(phydev, temp); 2414 break; 2415 default: 2417 } 2418 2419 return err; 2420 } 2421 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org