Hi Vincent, I love your patch! Yet something to improve: [auto build test ERROR on mkl-can-next/testing] [also build test ERROR on v5.18-rc6 next-20220513] [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/intel-lab-lkp/linux/commits/Vincent-Mailhol/can-skb-move-can_dropped_invalid_skb-and-can_skb_headroom_valid-to-skb-c/20220514-003707 base: https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git testing config: arm-randconfig-r021-20220512 (https://download.01.org/0day-ci/archive/20220514/202205141221.H0aZXRak-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 38189438b69ca27b4c6ce707c52dbd217583d046) 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/intel-lab-lkp/linux/commit/8f56e6b1b9945ea47c9f410d1254451df9d6fe22 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Vincent-Mailhol/can-skb-move-can_dropped_invalid_skb-and-can_skb_headroom_valid-to-skb-c/20220514-003707 git checkout 8f56e6b1b9945ea47c9f410d1254451df9d6fe22 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected >> ld.lld: error: undefined symbol: can_dropped_invalid_skb >>> referenced by vxcan.c:45 (drivers/net/can/vxcan.c:45) >>> net/can/vxcan.o:(vxcan_xmit) in archive drivers/built-in.a -- 0-DAY CI Kernel Test Service https://01.org/lkp
