linux-kernel - Re: [PATCH V3 2/2] perf/x86: Reset the dirty counter to prevent the leak for an RDPMC task

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Message-ID: <202104140454.EDz6DV9M-lkp@intel.com>
Date:   Wed, 14 Apr 2021 04:33:28 +0800
From:   kernel test robot <lkp@...el.com>
To:     kan.liang@...ux.intel.com, peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, acme@...nel.org, ak@...ux.intel.com,
        mark.rutland@....com, luto@...capital.net, eranian@...gle.com,
        namhyung@...nel.org, Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [PATCH V3 2/2] perf/x86: Reset the dirty counter to prevent the
 leak for an RDPMC task

Hi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/perf/core]
[also build test WARNING on tip/master linux/master linus/master v5.12-rc7 next-20210413]
[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]

url:    https://github.com/0day-ci/linux/commits/kan-liang-linux-intel-com/perf-x86-Move-cpuc-running-into-P4-specific-code/20210414-030649
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git cface0326a6c2ae5c8f47bd466f07624b3e348a7
config: i386-tinyconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/83f02393e1b5a2723294d8697f4fd5473d70602c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review kan-liang-linux-intel-com/perf-x86-Move-cpuc-running-into-P4-specific-code/20210414-030649
        git checkout 83f02393e1b5a2723294d8697f4fd5473d70602c
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> arch/x86/events/core.c:2309:6: warning: no previous prototype for 'x86_pmu_clear_dirty_counters' [-Wmissing-prototypes]
    2309 | void x86_pmu_clear_dirty_counters(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/x86_pmu_clear_dirty_counters +2309 arch/x86/events/core.c

  2308	
> 2309	void x86_pmu_clear_dirty_counters(void)
  2310	{
  2311		struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
  2312		int i;
  2313	
  2314		if (bitmap_empty(cpuc->dirty, X86_PMC_IDX_MAX))
  2315			return;
  2316	
  2317		 /* Don't need to clear the assigned counter. */
  2318		for (i = 0; i < cpuc->n_events; i++)
  2319			__clear_bit(cpuc->assign[i], cpuc->dirty);
  2320	
  2321		for_each_set_bit(i, cpuc->dirty, X86_PMC_IDX_MAX) {
  2322			/* Metrics and fake events don't have corresponding HW counters. */
  2323			if (is_metric_idx(i) || (i == INTEL_PMC_IDX_FIXED_VLBR))
  2324				continue;
  2325			else if (i >= INTEL_PMC_IDX_FIXED)
  2326				wrmsrl(MSR_ARCH_PERFMON_FIXED_CTR0 + (i - INTEL_PMC_IDX_FIXED), 0);
  2327			else
  2328				wrmsrl(x86_pmu_event_addr(i), 0);
  2329		}
  2330	
  2331		bitmap_zero(cpuc->dirty, X86_PMC_IDX_MAX);
  2332	}
  2333	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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