tree: https://github.com/c-sky/csky-linux linux-next-fixup-STRN head: 87cccc6b2c7d3265f6ba190c02797a097ce8134c commit: d3900e8d918f8fbd1366b9c2998e2830e66a0081 [4/5] csky: uaccess.h: Coding convention with asm generic config: csky-randconfig-r025-20210421 (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 # https://github.com/c-sky/csky-linux/commit/d3900e8d918f8fbd1366b9c2998e28... git remote add csky-linux https://github.com/c-sky/csky-linux git fetch --no-tags csky-linux linux-next-fixup-STRN git checkout d3900e8d918f8fbd1366b9c2998e2830e66a0081 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=csky If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): csky-linux-ld: fs/readdir.o: in function `__put_user_fn': csky-linux-ld: fs/readdir.o: in function `$d': readdir.c:(.text+0x94): undefined reference to `__put_user_bad' csky-linux-ld: fs/fat/dir.o: in function `$t': csky-linux-ld: fs/fat/dir.o: in function `$d': dir.c:(.text+0x688): undefined reference to `__put_user_bad' Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for LOCKDEP Depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT && (FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86) Selected by - PROVE_LOCKING && DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT - LOCK_STAT && DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT - DEBUG_LOCK_ALLOC && DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org