tree:   https://github.com/Xilinx/linux-xlnx master
head:   aa49d46895185f1aad49eb58b9fd365d9110f199
commit: 3a0dd946a8cd79058c4baebd74bd75f3dd045059 [9561/10001] staging: xlnxsync: Add driver for Xilinx Synchronizer
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project a9b137f9ffba8cb25dfd7dd1fb613e8aac121b37)
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 3a0dd946a8cd79058c4baebd74bd75f3dd045059
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   awk: ../arch/x86/tools/gen-insn-attr-x86.awk:260: warning: regexp escape sequence `\:' is not a known regexp operator
   awk: ../arch/x86/tools/gen-insn-attr-x86.awk:350: (FILENAME=../arch/x86/lib/x86-opcode-map.txt FNR=41) warning: regexp escape sequence `\&' is not a known regexp operator
   /usr/bin/ld: scripts/dtc/dtc-parser.tab.o:(.bss+0x10): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x58): first defined here
   clang-11: error: linker command failed with exit code 1 (use -v to see invocation)
   make[2]: *** [scripts/Makefile.host:116: scripts/dtc/dtc] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1263: scripts_dtc] Error 2
>> error: include/uapi/linux/xlnxsync.h: missing "WITH Linux-syscall-note" for SPDX-License-Identifier
   make[2]: *** [scripts/Makefile.headersinst:66: usr/include/linux/xlnxsync.h] Error 1
   error: include/uapi/linux/xilinx-v4l2-events.h: missing "WITH Linux-syscall-note" for SPDX-License-Identifier
   make[2]: *** [scripts/Makefile.headersinst:66: usr/include/linux/xilinx-v4l2-events.h] Error 1
   make[2]: Target '__headers' not remade because of errors.
   make[1]: *** [Makefile:1195: headers] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:179: sub-make] Error 2
   13 real  21 user  13 sys  264.30% cpu 	make prepare

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