[Devel] [PATCH vz10 00/15] selftests: fix compilation warnings across multiple tests

[Konstantin Khorenko]

Fix all GCC compilation warnings produced during kernel selftests build
(rpmbuild with -j48, GCC with -Wall).

The warnings fall into several categories:

 - Unused variables (-Wunused-variable, -Wunused-but-set-variable):
   remove or annotate unused variables in clone3, damon, epoll,
   membarrier, memfd/fuse_test, mqueue, netfilter, and prctl tests.

 - Possibly uninitialized (-Wmaybe-uninitialized):
   initialize variables where GCC cannot statically prove they are
   always assigned before use (cgroup/test_numa_migrate,
   uevent/uevent_filtering). In memfd/memfd_test, replace malloc()
   with calloc() since pwrite() is declared with attribute
   'access(read_only, 2, 3)' and GCC warns about reading from
   uninitialized heap memory.

 - Strict aliasing (-Wstrict-aliasing):
   suppress in breakpoints/breakpoint_test where type-punned reads
   are intentional -- the test needs sized memory accesses at specific
   addresses to trigger hardware breakpoints.

 - Array bounds (-Warray-bounds):
   suppress in iommu/iommufd_utils where the test intentionally
   passes an undersized buffer to exercise the kernel's bounds
   checking.

No functional changes.

https://virtuozzo.atlassian.net/browse/VSTOR-127529

Konstantin Khorenko (15):
  selftests/cgroup: fix -Wmaybe-uninitialized warning in
    test_numa_migrate
  selftests/clone3: remove unused variables in
    clone3_cap_checkpoint_restore
  selftests/damon: fix -Wunused-but-set-variable in
    huge_count_read_write
  selftests/epoll: remove unused variable 'pfd' in epoll59 test
  selftests/iommu: suppress -Warray-bounds in _test_cmd_get_hw_info
  selftests/membarrier: remove unused variable 'i'
  selftests/memfd: remove unused variable 'sig' in fuse_test
  selftests/memfd: fix -Wmaybe-uninitialized warning in memfd_test
  selftests/mqueue: fix -Wunused-variable warning for 'usage' in
    mq_open_tests
  selftests/mqueue: fix warnings in mq_perf_tests
  selftests/netfilter: remove unused variable 'plen' in
    conntrack_reverse_clash
  selftests/netfilter: remove unused variables in conntrack_dump_flush
  selftests/prctl: remove unused variable 'j' in set-process-name
  selftests/uevent: fix -Wmaybe-uninitialized warning in
    uevent_filtering
  selftests/breakpoints: fix compilation warnings in breakpoint_test

 .../selftests/breakpoints/breakpoint_test.c        | 14 ++++++++++----
 tools/testing/selftests/cgroup/test_numa_migrate.c |  1 +
 .../clone3/clone3_cap_checkpoint_restore.c         |  4 ----
 .../selftests/damon/huge_count_read_write.c        |  3 +--
 .../filesystems/epoll/epoll_wakeup_test.c          |  1 -
 tools/testing/selftests/iommu/iommufd_utils.h      |  7 +++++++
 .../membarrier/membarrier_test_multi_thread.c      |  1 -
 tools/testing/selftests/memfd/fuse_test.c          |  2 +-
 tools/testing/selftests/memfd/memfd_test.c         |  2 +-
 tools/testing/selftests/mqueue/mq_open_tests.c     |  2 +-
 tools/testing/selftests/mqueue/mq_perf_tests.c     |  4 +---
 .../selftests/net/netfilter/conntrack_dump_flush.c |  7 ++-----
 .../net/netfilter/conntrack_reverse_clash.c        |  1 -
 tools/testing/selftests/prctl/set-process-name.c   |  3 +--
 tools/testing/selftests/uevent/uevent_filtering.c  |  2 +-
 15 files changed, 27 insertions(+), 27 deletions(-)

-- 
2.47.1