[PATCH v6 0/2] scanf: convert self-test to KUnit

[Tamir Duberstein <tamird@gmail.com>]

This is one of just 3 remaining "Test Module" kselftests (the others
being bitmap and printf), the rest having been converted to KUnit. In
addition to the enclosed patch, please consider this an RFC on the
removal of the "Test Module" kselftest machinery.

I tested this using:

$ tools/testing/kunit/kunit.py run --arch arm64 --make_options LLVM=1 scanf

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
Changes in v6:
- s/at boot/at runtime/ for consistency with the printf series.
- Go back to kmalloc. (Geert Uytterhoeven)
- Link to v5: https://lore.kernel.org/r/20250210-scanf-kunit-convert-v5-0-8e64f3a7de99@gmail.com

Changes in v5:
- Remove extraneous trailing newlines from failure messages.
- Replace `pr_debug` with `kunit_printk`.
- Use static char arrays instead of kmalloc.
- Drop KUnit boilerplate from CONFIG_SCANF_KUNIT_TEST help text.
- Drop arch changes.
- Link to v4: https://lore.kernel.org/r/20250207-scanf-kunit-convert-v4-0-a23e2afaede8@gmail.com

Changes in v4:
- Bake `test` into various macros, greatly reducing diff noise.
- Revert control flow changes.
- Link to v3: https://lore.kernel.org/r/20250204-scanf-kunit-convert-v3-0-386d7c3ee714@gmail.com

Changes in v3:
- Reduce diff noise in lib/Makefile. (Petr Mladek)
- Split `scanf_test` into a few test cases. New output:
  : =================== scanf (10 subtests) ====================
  : [PASSED] numbers_simple
  : ====================== numbers_list  =======================
  : [PASSED] delim=" "
  : [PASSED] delim=":"
  : [PASSED] delim=","
  : [PASSED] delim="-"
  : [PASSED] delim="/"
  : ================== [PASSED] numbers_list ===================
  : ============ numbers_list_field_width_typemax  =============
  : [PASSED] delim=" "
  : [PASSED] delim=":"
  : [PASSED] delim=","
  : [PASSED] delim="-"
  : [PASSED] delim="/"
  : ======== [PASSED] numbers_list_field_width_typemax =========
  : =========== numbers_list_field_width_val_width  ============
  : [PASSED] delim=" "
  : [PASSED] delim=":"
  : [PASSED] delim=","
  : [PASSED] delim="-"
  : [PASSED] delim="/"
  : ======= [PASSED] numbers_list_field_width_val_width ========
  : [PASSED] numbers_slice
  : [PASSED] numbers_prefix_overflow
  : [PASSED] test_simple_strtoull
  : [PASSED] test_simple_strtoll
  : [PASSED] test_simple_strtoul
  : [PASSED] test_simple_strtol
  : ====================== [PASSED] scanf ======================
  : ============================================================
  : Testing complete. Ran 22 tests: passed: 22
  : Elapsed time: 5.517s total, 0.001s configuring, 5.440s building, 0.067s running
- Link to v2: https://lore.kernel.org/r/20250203-scanf-kunit-convert-v2-1-277a618d804e@gmail.com

Changes in v2:
- Rename lib/{test_scanf.c => scanf_kunit.c}. (Andy Shevchenko)
- Link to v1: https://lore.kernel.org/r/20250131-scanf-kunit-convert-v1-1-0976524f0eba@gmail.com

---
Tamir Duberstein (2):
      scanf: convert self-test to KUnit
      scanf: break kunit into test cases

 MAINTAINERS                          |   2 +-
 lib/Kconfig.debug                    |  12 +-
 lib/Makefile                         |   2 +-
 lib/{test_scanf.c => scanf_kunit.c}  | 274 +++++++++++++++++------------------
 tools/testing/selftests/lib/Makefile |   2 +-
 tools/testing/selftests/lib/config   |   1 -
 tools/testing/selftests/lib/scanf.sh |   4 -
 7 files changed, 145 insertions(+), 152 deletions(-)
---
base-commit: a64dcfb451e254085a7daee5fe51bf22959d52d3
change-id: 20250131-scanf-kunit-convert-f70dc33bb34c

Best regards,
-- 
Tamir Duberstein <tamird@gmail.com>