Hi Stephan, I love your patch! Yet something to improve: [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Stephan-Gerhold/net-wwan-Add-RPM... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 8fe088bd4fd12f4c8899b51d5bc3daad98767d49 config: arm-randconfig-r024-20210618 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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/0day-ci/linux/commit/3e8b96e21bab08cfd3136fb7348c4cb77... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Stephan-Gerhold/net-wwan-Add-RPMSG-WWAN-CTRL-driver/20210618-155527 git checkout 3e8b96e21bab08cfd3136fb7348c4cb77815e969 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): .tx = wdm_wwan_port_tx, ^~~~~~~~~~~~~~~~ 1 error generated. vim +917 drivers/usb/class/cdc-wdm.c cac6fb015f7191 Loic Poulain 2021-05-11 913 cac6fb015f7191 Loic Poulain 2021-05-11 914 static struct wwan_port_ops wdm_wwan_port_ops = { cac6fb015f7191 Loic Poulain 2021-05-11 915 .start = wdm_wwan_port_start, cac6fb015f7191 Loic Poulain 2021-05-11 916 .stop = wdm_wwan_port_stop, cac6fb015f7191 Loic Poulain 2021-05-11 @917 .tx = wdm_wwan_port_tx, cac6fb015f7191 Loic Poulain 2021-05-11 918 }; cac6fb015f7191 Loic Poulain 2021-05-11 919 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org