linux-kernel - Re: [PATCHv2] perf/x86/intel: Account interrupts for PEBS errors

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Message-ID: <201612160736.BAd9BYGY%fengguang.wu@intel.com>
Date:   Fri, 16 Dec 2016 07:41:04 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     kbuild-all@...org, Peter Zijlstra <peterz@...radead.org>,
        Andi Kleen <andi@...stfloor.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Vince Weaver <vince@...ter.net>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCHv2] perf/x86/intel: Account interrupts for PEBS errors

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

Download attachment ".config.gz" of type "application/gzip" (21922 bytes)