tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 2734d6c1b1a089fb593ef6a23d4b70903526fe0c commit: 2cc7b6a44ac21d31b398b03f4845c53152070416 lib: add fast path for find_first_*_bit() and find_last_bit() date: 2 months ago config: x86_64-randconfig-r026-20210720 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 5d5b08761f944d5b9822d582378333cc4b36a0a7) 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 2cc7b6a44ac21d31b398b03f4845c53152070416 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=x86_64 SHELL=/bin/bash 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 >>, old ones prefixed by <<): The function __first_node() references the variable __initdata numa_nodes_parsed. This is often because __first_node lacks a __initdata annotation or the annotation of numa_nodes_parsed is wrong. The below error/warnings are from parent commit: << WARNING: modpost: vmlinux.o(.text+0x18ddf7): Section mismatch in reference from the function test_bit() to the variable .init.data:numa_nodes_parsed << WARNING: modpost: vmlinux.o(.text+0x18de2c): Section mismatch in reference from the function __nodes_weight() to the variable .init.data:numa_nodes_parsed << WARNING: modpost: vmlinux.o(.text+0x18de51): Section mismatch in reference from the function __next_node() to the variable .init.data:numa_nodes_parsed << WARNING: modpost: vmlinux.o(.text+0x4dc0cd): Section mismatch in reference from the function shuffle_zone() to the function .meminit.text:__shuffle_zone() --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org