linux-kernel - Re: [PATCH V2 1/8] perf: Add PERF_SAMPLE_PHYS

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Date:	Fri, 8 Jan 2016 05:08:46 +0800
From:	kbuild test robot <lkp@...el.com>
To:	kan.liang@...el.com
Cc:	kbuild-all@...org, peterz@...radead.org, acme@...nel.org,
	eranian@...gle.com, ak@...ux.intel.com, jolsa@...nel.org,
	namhyung@...nel.org, linux-kernel@...r.kernel.org,
	Kan Liang <kan.liang@...el.com>
Subject: Re: [PATCH V2 1/8] perf: Add PERF_SAMPLE_PHYS_ADDR

Hi Kan,

[auto build test WARNING on tip/perf/core]
[also build test WARNING on v4.4-rc8 next-20160107]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/kan-liang-intel-com/perf-Add-PERF_SAMPLE_PHYS_ADDR/20160108-045715
config: i386-tinyconfig (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   arch/x86/kernel/cpu/perf_event_intel_ds.c: In function 'setup_pebs_sample_data':
>> arch/x86/kernel/cpu/perf_event_intel_ds.c:1087:41: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
        data->phys_addr = (u64)virt_to_phys((void *)data->addr);
                                            ^

vim +1087 arch/x86/kernel/cpu/perf_event_intel_ds.c

  1071			regs->ip = pebs->real_ip;
  1072			regs->flags |= PERF_EFLAGS_EXACT;
  1073		} else if (event->attr.precise_ip > 1 && intel_pmu_pebs_fixup_ip(regs))
  1074			regs->flags |= PERF_EFLAGS_EXACT;
  1075		else
  1076			regs->flags &= ~PERF_EFLAGS_EXACT;
  1077	
  1078		if ((sample_type & PERF_SAMPLE_ADDR) &&
  1079		    x86_pmu.intel_cap.pebs_format >= 1)
  1080			data->addr = pebs->dla;
  1081	
  1082		if ((sample_type & PERF_SAMPLE_PHYS_ADDR) && (data->addr != 0)) {
  1083			if (data->addr >= TASK_SIZE) {
  1084				/* If it's vmalloc()d memory, leave phys_addr as 0 */
  1085				if (virt_addr_valid(data->addr) &&
  1086				    !(data->addr >= VMALLOC_START && data->addr < VMALLOC_END))
> 1087					data->phys_addr = (u64)virt_to_phys((void *)data->addr);
  1088			} else {
  1089				/*
  1090				 * Walking the pages tables for user address.
  1091				 * Interrupts are disabled, so it prevents any tear down
  1092				 * of the page tables.
  1093				 * Try IRQ-safe __get_user_pages_fast first.
  1094				 * If failed, leave phys_addr as 0.
  1095				 */

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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