Hi Ganapatrao, [auto build test WARNING on linus/master] [also build test WARNING on v4.12-rc3 next-20170531] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Ganapatrao-Kulkarni/perf-uncore-Adding-documentation-for-ThunderX2-pmu-uncore-driver/20170531-204518 config: i386-allmodconfig (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): drivers/perf/thunderx2_pmu.c: In function 'thunderx2_uncore_update': >> drivers/perf/thunderx2_pmu.c:499:18: warning: left shift count >= width of >> type [-Wshift-count-overflow] delta = (((1UL << 32) - prev) + new); ^~ vim +499 drivers/perf/thunderx2_pmu.c 483 u64 delta; 484 struct hw_perf_event *hwc = &event->hw; 485 struct thunderx2_pmu_uncore_channel *pmu_uncore; 486 enum thunderx2_uncore_type type; 487 488 pmu_uncore = pmu_to_thunderx2_pmu_uncore(event->pmu); 489 type = pmu_uncore->uncore_dev->type; 490 491 if (pmu_uncore->uncore_dev->select_channel) 492 pmu_uncore->uncore_dev->select_channel(event); 493 494 new = reg_readl(hwc->event_base); 495 prev = local64_xchg(&hwc->prev_count, new); 496 497 /* handle rollover of counters */ 498 if (new < prev) > 499 delta = (((1UL << 32) - prev) + new); 500 else 501 delta = new - prev; 502 503 local64_add(delta, &event->count); 504 } 505 506 enum thunderx2_uncore_type get_uncore_device_type(struct acpi_device *adev) 507 { --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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