Hi Akira,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.15 next-20211111]
[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/Akira-Tsukamoto/__asm_copy_to-from_user-Reduce-more-byte_copy/20211111-161445
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git debe436e77c72fcee804fb867f275e6d31aa999c
config: riscv-buildonly-randconfig-r002-20211111 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 63ef0e17e28827eae53133b3467bdac7d9729318)
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
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/cf2e8e9c4e9dc65552ca5ac0c85c198785f5d91c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Akira-Tsukamoto/__asm_copy_to-from_user-Reduce-more-byte_copy/20211111-161445
        git checkout cf2e8e9c4e9dc65552ca5ac0c85c198785f5d91c
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 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 >>):

>> <instantiation>:5:14: error: unknown token in expression
    .word 100b, 
                ^
   arch/riscv/lib/uaccess.S:92:2: note: while in macro instantiation
    fixup lw a5, 0(a1)
    ^
>> <instantiation>:5:14: error: unknown token in expression
    .word 100b, 
                ^
   arch/riscv/lib/uaccess.S:94:2: note: while in macro instantiation
    fixup sw a5, 0(a0)
    ^

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