tree:   https://github.com/c-sky/csky-linux linux-5.15-rc1-d1-v4
head:   88c6ea42e010e46e58be159efa07cda22d95a512
commit: f172e026b6879dfebc027017717516b8472bc303 [2/7] riscv: errata: pgtable: Add custom Svpbmt supported for Allwinner D1
config: riscv-randconfig-r001-20210904 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 11.2.0
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/f172e026b6879dfebc027017717516b8472bc303
        git remote add csky-linux https://github.com/c-sky/csky-linux
        git fetch --no-tags csky-linux linux-5.15-rc1-d1-v4
        git checkout f172e026b6879dfebc027017717516b8472bc303
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   riscv32-linux-ld: arch/riscv/mm/init.o: in function `setup_vm':
>> init.c:(.init.text+0x202): undefined reference to `apply_vendor_setup_vm'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org