[ammarfaizi2-block:palmer/linux/riscv-pmu 13/15] drivers/perf/riscv_pmu_sbi.c:498: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

[kernel test robot]

tree:   https://github.com/ammarfaizi2/linux-block palmer/linux/riscv-pmu
head:   33363c336516e4beb9dd7e8265b369ff96d07dcb
commit: 4905ec2fb7e6421c14c9fb7276f5aa92f60f2b98 [13/15] RISC-V: Add sscofpmf extension support
config: riscv-randconfig-r042-20220320 (https://download.01.org/0day-ci/archive/20220322/202203221658.OweUGgeC-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 85e9b2687a13d1908aa86d1b89c5ce398a06cd39)
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/ammarfaizi2/linux-block/commit/4905ec2fb7e6421c14c9fb7276f5aa92f60f2b98
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block palmer/linux/riscv-pmu
        git checkout 4905ec2fb7e6421c14c9fb7276f5aa92f60f2b98
        # 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 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 >>):

   drivers/perf/riscv_pmu_sbi.c:42: warning: cannot understand function prototype: 'union sbi_pmu_ctr_info *pmu_ctr_list; '
>> drivers/perf/riscv_pmu_sbi.c:498: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * This function starts all the used counters in two step approach.


vim +498 drivers/perf/riscv_pmu_sbi.c

   496	
   497	/**
 > 498	 * This function starts all the used counters in two step approach.
   499	 * Any counter that did not overflow can be start in a single step
   500	 * while the overflowed counters need to be started with updated initialization
   501	 * value.
   502	 */
   503	static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
   504						       unsigned long ctr_ovf_mask)
   505	{
   506		int idx = 0;
   507		struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
   508		struct perf_event *event;
   509		unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
   510		unsigned long ctr_start_mask = 0;
   511		uint64_t max_period;
   512		struct hw_perf_event *hwc;
   513		u64 init_val = 0;
   514	
   515		ctr_start_mask = cpu_hw_evt->used_hw_ctrs[0] & ~ctr_ovf_mask;
   516	
   517		/* Start all the counters that did not overflow in a single shot */
   518		sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, 0, ctr_start_mask,
   519			  0, 0, 0, 0);
   520	
   521		/* Reinitialize and start all the counter that overflowed */
   522		while (ctr_ovf_mask) {
   523			if (ctr_ovf_mask & 0x01) {
   524				event = cpu_hw_evt->events[idx];
   525				hwc = &event->hw;
   526				max_period = riscv_pmu_ctr_get_width_mask(event);
   527				init_val = local64_read(&hwc->prev_count) & max_period;
   528				sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1,
   529					  flag, init_val, 0, 0);
   530			}
   531			ctr_ovf_mask = ctr_ovf_mask >> 1;
   532			idx++;
   533		}
   534	}
   535	

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