Hi Palmer,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9f29bd8b2e7132b409178d1367dae1813017bd0e
commit: c2c81bb2f69138f902e1a58d3bef6ad97fb8a92c RISC-V: Fix the VDSO symbol generaton for binutils-2.35+
date:   3 months ago
config: riscv-randconfig-r002-20210122 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project bd3a387ee76f58caa0d7901f3f84e9bb3d006f27)
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/torvalds/linux.git/commit/?id=c2c81bb2f69138f902e1a58d3bef6ad97fb8a92c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout c2c81bb2f69138f902e1a58d3bef6ad97fb8a92c
        # 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>

All errors (new ones prefixed by >>):

   arch/riscv/kernel/vdso/vdso-syms.S: Assembler messages:
>> arch/riscv/kernel/vdso/vdso-syms.S:2: Error: junk at end of line, first unrecognized character is `@'
   arch/riscv/kernel/vdso/vdso-syms.S:4: Error: junk at end of line, first unrecognized character is `@'
   arch/riscv/kernel/vdso/vdso-syms.S:6: Error: junk at end of line, first unrecognized character is `@'
   arch/riscv/kernel/vdso/vdso-syms.S:8: Error: junk at end of line, first unrecognized character is `@'
   arch/riscv/kernel/vdso/vdso-syms.S:10: Error: junk at end of line, first unrecognized character is `@'
   arch/riscv/kernel/vdso/vdso-syms.S:12: Error: junk at end of line, first unrecognized character is `@'
   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