[PATCH v2 1/2] perf: starfive: Add StarLink PMU support

[kernel test robot]

Hi Ji,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on arm-perf/for-next/perf tip/smp/core linus/master v6.7-rc1 next-20231114]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ji-Sheng-Teoh/perf-starfive-Add-StarLink-PMU-support/20231114-101811
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20231114021254.3009799-2-jisheng.teoh%40starfivetech.com
patch subject: [PATCH v2 1/2] perf: starfive: Add StarLink PMU support
config: riscv-allyesconfig (https://download.01.org/0day-ci/archive/20231114/202311142041.nSLDeqju-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231114/202311142041.nSLDeqju-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <yujie.liu at intel.com>
| Closes: https://lore.kernel.org/r/202311142041.nSLDeqju-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/perf/starfive_starlink_pmu.c:158:6: warning: no previous prototype for 'starlink_pmu_set_event_period' [-Wmissing-prototypes]
     158 | void starlink_pmu_set_event_period(struct perf_event *event)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/starlink_pmu_set_event_period +158 drivers/perf/starfive_starlink_pmu.c

cff226048d4861 Ji Sheng Teoh 2023-11-14  157  
cff226048d4861 Ji Sheng Teoh 2023-11-14 @158  void starlink_pmu_set_event_period(struct perf_event *event)
cff226048d4861 Ji Sheng Teoh 2023-11-14  159  {
cff226048d4861 Ji Sheng Teoh 2023-11-14  160  	struct starlink_pmu *starlink_pmu = to_starlink_pmu(event->pmu);
cff226048d4861 Ji Sheng Teoh 2023-11-14  161  	struct hw_perf_event *hwc = &event->hw;
cff226048d4861 Ji Sheng Teoh 2023-11-14  162  	int idx = event->hw.idx;
cff226048d4861 Ji Sheng Teoh 2023-11-14  163  
cff226048d4861 Ji Sheng Teoh 2023-11-14  164  	/*
cff226048d4861 Ji Sheng Teoh 2023-11-14  165  	 * Program counter to half of it's max count to handle
cff226048d4861 Ji Sheng Teoh 2023-11-14  166  	 * cases of extreme interrupt latency.
cff226048d4861 Ji Sheng Teoh 2023-11-14  167  	 */
cff226048d4861 Ji Sheng Teoh 2023-11-14  168  	u64 val = STARLINK_PMU_COUNTER_MASK >> 1;
cff226048d4861 Ji Sheng Teoh 2023-11-14  169  
cff226048d4861 Ji Sheng Teoh 2023-11-14  170  	local64_set(&hwc->prev_count, val);
cff226048d4861 Ji Sheng Teoh 2023-11-14  171  	if (hwc->config == CYCLES)
cff226048d4861 Ji Sheng Teoh 2023-11-14  172  		writeq(val, starlink_pmu->pmu_base + STARLINK_PMU_CYCLE_COUNTER);
cff226048d4861 Ji Sheng Teoh 2023-11-14  173  	else
cff226048d4861 Ji Sheng Teoh 2023-11-14  174  		writeq(val, starlink_pmu->pmu_base + STARLINK_PMU_EVENT_COUNTER +
cff226048d4861 Ji Sheng Teoh 2023-11-14  175  		       idx * sizeof(u64));
cff226048d4861 Ji Sheng Teoh 2023-11-14  176  }
cff226048d4861 Ji Sheng Teoh 2023-11-14  177  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki