Re: [PATCH v2 4/6] perf test pmu: Add an eagerly loaded event test

Re: [PATCH v2 4/6] perf test pmu: Add an eagerly loaded event test

[kernel test robot]

:::::: 
:::::: Manual check reason: "low confidence bisect report"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
In-Reply-To: <20240423031719.1941141-5-irogers@google.com>
References: <20240423031719.1941141-5-irogers@google.com>
TO: Ian Rogers <irogers@google.com>
TO: Kan Liang <kan.liang@linux.intel.com>
TO: Peter Zijlstra <peterz@infradead.org>
TO: Ingo Molnar <mingo@redhat.com>
TO: Arnaldo Carvalho de Melo <acme@kernel.org>
TO: Namhyung Kim <namhyung@kernel.org>
TO: Mark Rutland <mark.rutland@arm.com>
TO: Alexander Shishkin <alexander.shishkin@linux.intel.com>
TO: Jiri Olsa <jolsa@kernel.org>
TO: Ian Rogers <irogers@google.com>
TO: Adrian Hunter <adrian.hunter@intel.com>
TO: Jonathan Corbet <corbet@lwn.net>
TO: Bjorn Helgaas <helgaas@kernel.org>
TO: Randy Dunlap <rdunlap@infradead.org>
TO: Jing Zhang <renyu.zj@linux.alibaba.com>
TO: James Clark <james.clark@arm.com>
TO: Ravi Bangoria <ravi.bangoria@amd.com>
TO: linux-kernel@vger.kernel.org
TO: linux-perf-users@vger.kernel.org

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-rc5 next-20240423]
[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/20240423-112057
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/20240423031719.1941141-5-irogers%40google.com
patch subject: [PATCH v2 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/20240424/202404241018.bgi3yFxj-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@intel.com>
| Closes: https://lore.kernel.org/r/202404241018.bgi3yFxj-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 = 6.8.ged816a028ac7
   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

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