tree: https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/netfs-lib head: e229088c2bc0ba29fdff1bc737506aed6ec50581 commit: eab3170e20c001ee23073a8705db22713b529c21 [19/23] netfs: Provide invalidatepage and releasepage calls config: x86_64-kexec (https://download.01.org/0day-ci/archive/20220119/202201190316.hRrB5y0R-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/ammarfaizi2/linux-block/commit/eab3170e20c001ee23073a8... git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/netfs-lib git checkout eab3170e20c001ee23073a8705db22713b529c21 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash 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 >>): ld: fs/cifs/file.o:(.rodata+0x348): undefined reference to `netfs_invalidatepage' ld: fs/cifs/file.o:(.rodata+0x350): undefined reference to `netfs_releasepage' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org