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[Jürg Häfliger <2000772@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/2000772

Title:
  powerpc-build in ubuntu_kernel_selftests failed on P9 with K-5.19

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Kinetic:
  Fix Released

Bug description:
  [Impact]
  When trying to build powerpc tests from ubuntu_kernel_selftests, it 
  will fail with:
      inlined from ‘cycles_with_mmcr2’ at cycles_with_mmcr2_test.c:81:3:
  /usr/include/powerpc64le-linux-gnu/bits/stdio2.h:86:10: error: ‘actual’ may be used uninitialized [-Werror=maybe-uninitialized]
     86 | return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack ());
        | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  cycles_with_mmcr2_test.c: In function ‘cycles_with_mmcr2’:
  cycles_with_mmcr2_test.c:25:36: note: ‘actual’ was declared here
     25 | uint64_t val, expected[2], actual;
        | ^~~~~~
  cc1: all warnings being treated as errors

  [Fix]
  * ff446cd768 "selftests/powerpc: Avoid GCC 12 uninitialised variable warning"
  This patch can be cherry-picked into Kinetic kernel.

  [Test]
  Apply this patch to the kernel tree and build it with:
  sudo make -C linux/tools/testing/selftests TARGETS=powerpc

  With this error fixed, test compliation can finish without any issue.

  [Where problems could occur]
  Change for test case, no impact to acutal function.

  [Original Bug Report]
  Issue found with K-5.19.0-28-generic on P9 node baltar

  This should not be considered as a regression since
  ubuntu_kernel_selftests will be blocked by the net test crash before
  this powerpc tests can be started. This was found by manually running
  the test.

  Test build failed with:
  gcc -std=gnu99 -O2 -Wall -Werror -DGIT_VERSION='"unknown"' -I/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/include  -m64   -no-pie  cycles_with_mmcr2_test.c ../../harness.c ../../utils.c ../event.c ../lib.c ebb.c ebb_handler.S trace.c busy_loop.S  -o /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test
  In file included from /usr/include/stdio.h:906,
                   from cycles_with_mmcr2_test.c:6:
  In function ‘printf’,
      inlined from ‘cycles_with_mmcr2’ at cycles_with_mmcr2_test.c:81:3:
  /usr/include/powerpc64le-linux-gnu/bits/stdio2.h:86:10: error: ‘actual’ may be used uninitialized [-Werror=maybe-uninitialized]
     86 |   return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack ());
        |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  cycles_with_mmcr2_test.c: In function ‘cycles_with_mmcr2’:
  cycles_with_mmcr2_test.c:25:36: note: ‘actual’ was declared here
     25 |         uint64_t val, expected[2], actual;
        |                                    ^~~~~~
  cc1: all warnings being treated as errors
  make[3]: *** [../../../lib.mk:173: /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test] Error 1

  Please find attachment for the complete build log.

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