Hi Lorenz, I love your patch! Yet something to improve: [auto build test ERROR on bpf/master] url: https://github.com/0day-ci/linux/commits/Lorenz-Bauer/Expose-network-name... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master config: microblaze-randconfig-r003-20210209 (attached as .config) compiler: microblaze-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://github.com/0day-ci/linux/commit/ec096a87ec268b0634a140515fb54b21a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Lorenz-Bauer/Expose-network-namespace-cookies-to-user-space/20210210-201857 git checkout ec096a87ec268b0634a140515fb54b21a2c67036 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 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 >>): microblaze-linux-ld: fs/nsfs.o: in function `ns_ioctl': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org