tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 28b2caccd679faae83cc61e008d7cc8009933988 commit: d80280f7df4f4be25d67a6460b63b3d2e0b5170d [3158/22214] perf: add arm64 smmuv3 pmu driver config: arm64-randconfig-002-20240426 (https://download.01.org/0day-ci/archive/20240426/202404260704.Qvd9eJqD-lkp@i...) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240426/202404260704.Qvd9eJqD-lkp@i...)

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 lkp@intel.com | Closes: https://lore.kernel.org/oe-kbuild-all/202404260704.Qvd9eJqD-lkp@intel.com/

All warnings (new ones prefixed by >>):

...

drivers/perf/arm_smmuv3_pmu.c:459:9: warning: no previous prototype for 'smmu_pmu_event_show' [-Wmissing-prototypes]

459 | ssize_t smmu_pmu_event_show(struct device *dev, | ^~~~~~~~~~~~~~~~~~~

vim +/smmu_pmu_event_show +459 drivers/perf/arm_smmuv3_pmu.c

458

459 ssize_t smmu_pmu_event_show(struct device *dev,

460 struct device_attribute *attr, char *page) 461 { 462 struct perf_pmu_events_attr *pmu_attr; 463 464 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); 465 466 return sprintf(page, "event=0x%02llx\n", pmu_attr->id); 467 } 468