Hi Jiri, [auto build test WARNING on tip/perf/core] [also build test WARNING on v4.9 next-20161215] [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/Jiri-Olsa/perf-x86-intel-Account-interrupts-for-PEBS-errors/20161216-042644 config: x86_64-randconfig-a0-12160640 (attached as .config) compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): kernel/events/core.c: In function '__perf_event_overflow': >> kernel/events/core.c:7086: warning: unused variable 'hwc' kernel/events/core.o: warning: objtool: perf_try_init_event()+0x43: function has unreachable instruction vim +/hwc +7086 kernel/events/core.c 7070 } 7071 7072 int perf_event_account_interrupt(struct perf_event *event) 7073 { 7074 return __perf_event_account_interrupt(event, 1); 7075 } 7076 7077 /* 7078 * Generic event overflow handling, sampling. 7079 */ 7080 7081 static int __perf_event_overflow(struct perf_event *event, 7082 int throttle, struct perf_sample_data *data, 7083 struct pt_regs *regs) 7084 { 7085 int events = atomic_read(&event->event_limit); > 7086 struct hw_perf_event *hwc = &event->hw; 7087 int ret = 0; 7088 7089 /* 7090 * Non-sampling counters might still use the PMI to fold short 7091 * hardware counters, ignore those. 7092 */ 7093 if (unlikely(!is_sampling_event(event))) 7094 return 0; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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