Hi Brendan, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: a96bfed64c8986d6404e553f18203cae1f5ac7e6 commit: 981f94c3e92146705baf97fb417a5ed1ab1a79a5 bpf: Add bitwise atomic instructions date: 5 months ago config: m68k-randconfig-r013-20210622 (attached as .config) compiler: m68k-linux-gcc (GCC) 9.3.0 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 # 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 981f94c3e92146705baf97fb417a5ed1ab1a79a5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 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 >>): kernel/bpf/core.c:1350:12: warning: no previous prototype for 'bpf_probe_read_kernel' [-Wmissing-prototypes] 1350 | u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr) | ^~~~~~~~~~~~~~~~~~~~~ kernel/bpf/core.c:1751:6: warning: no previous prototype for 'bpf_patch_call_args' [-Wmissing-prototypes] 1751 | void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth) | ^~~~~~~~~~~~~~~~~~~ {standard input}: Assembler messages: Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for ATARI_KBD_CORE Depends on !UML && INPUT && INPUT_KEYBOARD Selected by - MOUSE_ATARI && !UML && INPUT && INPUT_MOUSE && ATARI --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org