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

[kernel test robot]

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
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0

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 <yujie.liu@xxxxxxxxx>
| Closes: https://lore.kernel.org/r/202404241018.bgi3yFxj-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> 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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