linux-kernel - Re: [PATCH v3 4/6] perf test pmu: Add an eagerly loaded event test

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Date: Wed, 1 May 2024 11:05:45 +0800
From: kernel test robot <lkp@...el.com>
To: Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>,
	Thomas Richter <tmricht@...ux.ibm.com>, Peter Zijlstra
	<peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, "Arnaldo Carvalho de
 Melo" <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Mark Rutland
	<mark.rutland@....com>, Alexander Shishkin
	<alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, "Bjorn
 Helgaas" <helgaas@...nel.org>, Jonathan Corbet <corbet@....net>, Randy Dunlap
	<rdunlap@...radead.org>, Jing Zhang <renyu.zj@...ux.alibaba.com>, James Clark
	<james.clark@....com>, Ravi Bangoria <ravi.bangoria@....com>,
	<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC: <oe-kbuild-all@...ts.linux.dev>, Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v3 4/6] perf test pmu: Add an eagerly loaded event test

Hi Ian,

kernel test robot noticed the following build errors:

[auto build test ERROR on perf-tools-next/perf-tools-next]
[also build test ERROR on tip/perf/core perf-tools/perf-tools linus/master v6.9-rc6 next-20240430]
[cannot apply to acme/perf/core]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ian-Rogers/perf-test-pmu-events-Make-it-clearer-that-pmu-events-tests-json-events/20240430-040959
base:   https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git perf-tools-next
patch link:    https://lore.kernel.org/r/20240429200225.1271876-5-irogers%40google.com
patch subject: [PATCH v3 4/6] perf test pmu: Add an eagerly loaded event test
:::::: branch date: 23 hours ago
:::::: commit date: 23 hours ago
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240501/202405010256.1BDkfF0K-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/r/202405010256.1BDkfF0K-lkp@intel.com/

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All errors (new ones prefixed by >>):

     PERF_VERSION = 6.9.rc5.gea45a6cddbea
   tests/pmu.c: In function 'test_pmu_get':
   tests/pmu.c:89:9: error: ignoring return value of 'write' declared with attribute 'warn_unused_result' [-Werror=unused-result]
      89 |         write(file, "9999\n", 5);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~
   tests/pmu.c:128:9: error: ignoring return value of 'write' declared with attribute 'warn_unused_result' [-Werror=unused-result]
     128 |         write(file, test_event, strlen(test_event));
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   tests/pmu.c: In function 'test__pmu_events':
>> tests/pmu.c:241:16: error: 'ret' may be used uninitialized [-Werror=maybe-uninitialized]
     241 |         return ret;
         |                ^~~
   tests/pmu.c:198:13: note: 'ret' was declared here
     198 |         int ret;
         |             ^~~
   cc1: all warnings being treated as errors
   make[7]: *** [tools/build/Makefile.build:106: tools/perf/tests/pmu.o] Error 1
   make[7]: *** Waiting for unfinished jobs....
   make[6]: *** [tools/build/Makefile.build:158: tests] Error 2
   make[6]: *** Waiting for unfinished jobs....
   make[5]: *** [Makefile.perf:727: tools/perf/perf-in.o] Error 2
   make[5]: *** Waiting for unfinished jobs....
   make[4]: *** [Makefile.perf:264: sub-make] Error 2
   make[3]: *** [Makefile:70: all] Error 2

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki