tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next.mmap-fault
head:   caf380f33115de28cbd1d497390d346bedac8238
commit: 4423c35bf0a030f43fb8623a55418b727606c842 [1/5] iov_iter: Introduce fault_in_iov_iter helper
config: riscv-nommu_k210_defconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/commit/?id=4423c35bf0a030f43fb8623a55418b727606c842
        git remote add gfs2 https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git
        git fetch --no-tags gfs2 for-next.mmap-fault
        git checkout 4423c35bf0a030f43fb8623a55418b727606c842
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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: lib/iov_iter.o: in function `.L152':
>> iov_iter.c:(.text+0x7a4): undefined reference to `fault_in_user_pages'

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