ttm_bo_vm.c:undefined reference to `vmf_insert_pfn_prot'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1831fed559732b132aef0ea8261ac77e73f7eadf
commit: a0f25a6bb319aa05e04dcf51707c97c2881b4f47 drm/hisilicon/hibmc: Allow to be built if COMPILE_TEST is enabled
date:   2 months ago
config: riscv-buildonly-randconfig-r005-20220408 (https://download.01.org/0day-ci/archive/20220408/202204081648.gV63Gt0t-lkp@intel.com/config)
compiler: riscv64-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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a0f25a6bb319aa05e04dcf51707c97c2881b4f47
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a0f25a6bb319aa05e04dcf51707c97c2881b4f47
        # save the config file 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 >>):

   riscv64-linux-ld: drivers/gpu/drm/ttm/ttm_bo_vm.o: in function `.L97':
>> ttm_bo_vm.c:(.text+0x81c): undefined reference to `vmf_insert_pfn_prot'
   riscv64-linux-ld: drivers/gpu/drm/ttm/ttm_bo_vm.o: in function `.L0 ':
   ttm_bo_vm.c:(.text+0x9d8): undefined reference to `vmf_insert_pfn_prot'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for DRM_TTM
   Depends on HAS_IOMEM && DRM && MMU
   Selected by
   - DRM_TTM_HELPER && HAS_IOMEM && DRM
   - DRM_HISI_HIBMC && HAS_IOMEM && DRM && PCI && (ARM64 || COMPILE_TEST

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp