Hi Chuck, I love your patch! Yet something to improve: [auto build test ERROR on nfs/linux-next] [also build test ERROR on nfsd/nfsd-next linus/master v5.14-rc5 next-20210809] [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/Chuck-Lever/SunRPC-fault-injecti... base: git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next config: h8300-buildonly-randconfig-r001-20210809 (attached as .config) compiler: h8300-linux-gcc (GCC) 10.3.0 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/561bf84b4d936dc5ae88b55b133def1b7... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Chuck-Lever/SunRPC-fault-injection/20210810-021150 git checkout 561bf84b4d936dc5ae88b55b133def1b7e50d263 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=h8300 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 >>): h8300-linux-ld: net/sunrpc/svc.o: in function `svc_process': h8300-linux-ld: svc.c:(.text+0x23ac): undefined reference to `fail_sunrpc' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org