[linux-next:master 13539/13785] /tmp/drm_dp_dual_mode_helper-740770.s:367: Error: unrecognized opcode `zext.b a1,a1'

[linux-next:master 13539/13785] /tmp/drm_dp_dual_mode_helper-740770.s:367: Error: unrecognized opcode `zext.b a1,a1'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   0d52778b8710eb11cb616761a02aee0a7fd60425
commit: af2686efa5baa8eb00c4f13fd284cb228585d162 [13539/13785] leds: leds-lm3533: convert comma to semicolon
config: riscv-randconfig-r014-20201217 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=af2686efa5baa8eb00c4f13fd284cb228585d162
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout af2686efa5baa8eb00c4f13fd284cb228585d162
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 

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

Note: the linux-next/master HEAD 0d52778b8710eb11cb616761a02aee0a7fd60425 builds fine.
      It may have been fixed somewhere.

All errors (new ones prefixed by >>):

   /tmp/drm_dp_dual_mode_helper-740770.s: Assembler messages:
>> /tmp/drm_dp_dual_mode_helper-740770.s:367: Error: unrecognized opcode `zext.b a1,a1'
   clang-12: error: assembler command failed with exit code 1 (use -v to see invocation)

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

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