arch/riscv/kernel/cpu.c:113: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ae085d7f9365de7da27ab5c0d16b12d51ea7fca9
commit: a9b202606c69312cdaa4db187837820ebf7213b2 RISC-V: Improve /proc/cpuinfo output for ISA extensions
date:   11 days ago
config: riscv-randconfig-r042-20220328 (https://download.01.org/0day-ci/archive/20220328/202203281524.uFcj0Opf-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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=a9b202606c69312cdaa4db187837820ebf7213b2
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a9b202606c69312cdaa4db187837820ebf7213b2
        # save the config file 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 arch/riscv/kernel/ drivers/perf/

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

All warnings (new ones prefixed by >>):

   arch/riscv/kernel/cpu.c:89: warning: cannot understand function prototype: 'struct riscv_isa_ext_data isa_ext_arr[] = '
>> arch/riscv/kernel/cpu.c:113: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * These are the only valid base (single letter) ISA extensions as per the spec.


vim +113 arch/riscv/kernel/cpu.c

   111	
   112	/**
 > 113	 * These are the only valid base (single letter) ISA extensions as per the spec.
   114	 * It also specifies the canonical order in which it appears in the spec.
   115	 * Some of the extension may just be a place holder for now (B, K, P, J).
   116	 * This should be updated once corresponding extensions are ratified.
   117	 */
   118	static const char base_riscv_exts[13] = "imafdqcbkjpvh";
   119	

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