Hi Florian, kernel test robot noticed the following build errors: [auto build test ERROR on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Florian-Westphal/bpf-add-bpf_link-support-for-BPF_NETFILTER-programs/20230418-211350 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20230418131038.18054-2-fw%40strlen.de patch subject: [PATCH bpf-next v3 1/6] bpf: add bpf_link support for BPF_NETFILTER programs config: arm-allmodconfig (https://download.01.org/0day-ci/archive/20230419/202304191332.9uIkDScp-lkp@xxxxxxxxx/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 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://github.com/intel-lab-lkp/linux/commit/13cdccc8c376b453ae0ca2280ec22baa6210b450 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Florian-Westphal/bpf-add-bpf_link-support-for-BPF_NETFILTER-programs/20230418-211350 git checkout 13cdccc8c376b453ae0ca2280ec22baa6210b450 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202304191332.9uIkDScp-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): arm-linux-gnueabi-ld: net/netfilter/nf_bpf_link.o: in function `bpf_nf_link_release': >> nf_bpf_link.c:(.text+0x174): undefined reference to `__bad_cmpxchg' arm-linux-gnueabi-ld: net/netfilter/nf_bpf_link.o: in function `bpf_nf_link_detach': nf_bpf_link.c:(.text+0x200): undefined reference to `__bad_cmpxchg' -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
