Hi Zhou,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on kselftest/next linux/master linus/master v5.11-rc6]
[cannot apply to next-20210125]
[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/Zhou-Wang/mempinfd-Add-new-syscall-to-provide-memory-pin/20210207-162826
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
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://github.com/0day-ci/linux/commit/1d2c63431f0e72d73ac0d9a96d686e5335323efc
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Zhou-Wang/mempinfd-Add-new-syscall-to-provide-memory-pin/20210207-162826
        git checkout 1d2c63431f0e72d73ac0d9a96d686e5335323efc
        # 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: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> riscv64-linux-ld: arch/riscv/kernel/syscall_table.o:(.data+0xdd0): undefined reference to `sys_mempinfd'

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