Hi brookxu, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.12-rc7 next-20210413] [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/brookxu/delayacct-refactor-the-c... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 89698becf06d341a700913c3d89ce2a914af69a2 config: arm-randconfig-r005-20210413 (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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/7023a409dec95195a0e3360a36e8cb663... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review brookxu/delayacct-refactor-the-code-to-simplify-the-implementation/20210413-093934 git checkout 7023a409dec95195a0e3360a36e8cb66363a9457 # 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 >>): 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 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org