[v2,0/8] Add printf attribute to kselftest functions

Message

Maciej Wieczor-Retman Sept. 4, 2023, 12:43 p.m. UTC

Kselftest.h declares many variadic functions that can print some
formatted message while also executing selftest logic. These
declarations don't have any compiler mechanism to verify if passed
arguments are valid in comparison with format specifiers used in
printf() calls.

Attribute addition can make debugging easier, the code more consistent
and prevent mismatched or missing variables.

Add a __printf() macro that validates types of variables passed to the
format string. The macro is similarly used in other tools in the kernel.

Add __printf() attributes to function definitions inside kselftest.h that
use printing.

Adding the __printf() macro exposes some mismatches in format strings
across different selftests.

Fix the mismatched format specifiers in multiple tests.

Changelog v2:
- Add review and fixes tags to patches.
- Add two patches with mismatch fixes.
- Fix missed attribute in selftests/kvm. (Andrew)
- Fix previously missed issues in selftests/mm (Ilpo)

Wieczor-Retman Maciej (8):
  selftests: Add printf attribute to ksefltest prints
  selftests/cachestat: Fix print_cachestat format
  selftests/openat2: Fix wrong format specifier
  selftests/pidfd: Fix ksft print formats
  selftests/sigaltstack: Fix wrong format specifier
  selftests/kvm: Replace attribute with macro
  selftests/mm: Substitute attribute with a macro
  selftests/resctrl: Fix wrong format specifier

 .../selftests/cachestat/test_cachestat.c       |  2 +-
 tools/testing/selftests/kselftest.h            | 18 ++++++++++--------
 .../testing/selftests/kvm/include/test_util.h  |  8 ++++----
 tools/testing/selftests/mm/mremap_test.c       |  2 +-
 tools/testing/selftests/mm/pkey-helpers.h      |  2 +-
 tools/testing/selftests/openat2/openat2_test.c |  2 +-
 .../selftests/pidfd/pidfd_fdinfo_test.c        |  2 +-
 tools/testing/selftests/pidfd/pidfd_test.c     | 12 ++++++------
 tools/testing/selftests/resctrl/cache.c        |  2 +-
 tools/testing/selftests/sigaltstack/sas.c      |  2 +-
 10 files changed, 27 insertions(+), 25 deletions(-)


base-commit: 9b1db732866bee060b9bca9493e5ebf5e8874c48