Hi Kirill, Thank you for the patch! Yet something to improve: [auto build test ERROR on next-20200729] [also build test ERROR on v5.8-rc7] [cannot apply to cgroup/for-next tip/timers/core net-next/master sparc-next/master net/master linus/master v5.8-rc7 v5.8-rc6 v5.8-rc5] [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/Kirill-Tkhai/proc-Introduce-proc-namespaces-directory-to-expose-namespaces-lineary/20200730-200346 base: 04b4571786305a76ad81757bbec78eb16a5de582 config: csky-defconfig (attached as .config) compiler: csky-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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=csky If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): csky-linux-ld: fs/proc/namespaces.o: in function `$d': namespaces.c:(.text+0x1d0): undefined reference to `userns_operations' >> csky-linux-ld: namespaces.c:(.text+0x370): undefined reference to `userns_operations' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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