[kbuild-all] [linux-stable-rc:linux-5.4.y 2066/5257] ubsan.c:undefined reference to `__ashlti3'

Hi Kefeng, It's probably a bug fix that unveils the link errors. tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y head: cac6eb2794c85e7777fb0caac6fa75b6364d81a0 commit: 1865d6440fb63ad979d7034b2d7c94937bfd2200 [2066/5257] PCI: mobiveil: Fix csr_read()/write() build issue config: riscv-allyesconfig (attached as .config) compiler: riscv64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 1865d6440fb63ad979d7034b2d7c94937bfd2200 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): riscv64-linux-ld: lib/ubsan.o: in function `.L2': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org