[v9,0/6] scanf: convert self-test to KUnit

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

Failure output before this series:
  [  383.100048] test_scanf: vsscanf("1574 9 64ca 935b 7 142d ff58 0", "%4hx %1hx %4hx %4hx %1hx %4hx %4hx %1hx", ...) expected 2472240330 got 1690959881
  [  383.102843] test_scanf: vsscanf("f12:2:d:2:c166:1:36b:1906", "%3hx:%1hx:%1hx:%1hx:%4hx:%1hx:%3hx:%4hx", ...) expected 131085 got 851970
  [  383.105376] test_scanf: vsscanf("4,b2fe,3,593,6,0,3bde,0", "%1hx,%4hx,%1hx,%3hx,%1hx,%1hx,%4hx,%1hx", ...) expected 93519875 got 242430
  [  383.105659] test_scanf: vsscanf("6-1-2-1-d9e6-f-93e-e567", "%1hx-%1hx-%1hx-%1hx-%4hx-%1hx-%3hx-%4hx", ...) expected 65538 got 131073
  [  383.106127] test_scanf: vsscanf("72d6/35/e88d/1/0/6c8c/7/1", "%4hx/%2hx/%4hx/%1hx/%1hx/%4hx/%1hx/%1hx", ...) expected 125069 got 3901554741
  [  383.106235] test_scanf: vsscanf("c9bea1b8122113e9a168df573", "%4hx%4hx%1hx%4hx%4hx%1hx%4hx%3hx", ...) expected 571539457 got 106936
  ...
  [  383.106398] test_scanf: failed 6 out of 2545 tests

Failure output after this series:
      # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:94
  lib/scanf_kunit.c:555: vsscanf("0 1e 3e43 31f0 0 0 5797 9c70", "%1hx %2hx %4hx %4hx %1hx %1hx %4hx %4hx", ...) expected 837828163 got 1044578334
          not ok 1 " "
      # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:94
  lib/scanf_kunit.c:555: vsscanf("dc2:1c:0:3531:2621:5172:1:7", "%3hx:%2hx:%1hx:%4hx:%4hx:%4hx:%1hx:%1hx", ...) expected 892403712 got 28
          not ok 2 ":"
      # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:94
  lib/scanf_kunit.c:555: vsscanf("e083,8f6e,b,70ca,1,1,aab1,10e4", "%4hx,%4hx,%1hx,%4hx,%1hx,%1hx,%4hx,%4hx", ...) expected 1892286475 got 757614
          not ok 3 ","
      # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:94
  lib/scanf_kunit.c:555: vsscanf("2e72-8435-1-2fc-7cbd-c2f1-7158-2b41", "%4hx-%4hx-%1hx-%3hx-%4hx-%4hx-%4hx-%4hx", ...) expected 50069505 got 99381
          not ok 4 "-"
      # numbers_list_field_width_val_width: ASSERTION FAILED at lib/scanf_kunit.c:94
  lib/scanf_kunit.c:555: vsscanf("403/0/17/1/11e7/1/1fe8/34ba", "%3hx/%1hx/%2hx/%1hx/%4hx/%1hx/%4hx/%4hx", ...) expected 65559 got 1507328
          not ok 5 "/"

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
Changes in v9:
- Use __scanf correctly on `_test`. (Thanks to Petr Mladek).
- Split header `#include` cleanup into separate patch. (Petr Mladek)
- In "scanf: break kunit into test cases", revert to KUNIT_FAIL. (Petr
  Mladek)
- Rebase on linux-next.
- Add provisional patch "scanf: further break kunit into test cases".
  Please feel free to take this series without this patch if you prefer.
- Link to v8: https://lore.kernel.org/r/20250214-scanf-kunit-convert-v8-0-5ea50f95f83c@gmail.com

Changes in v8:
- Expand "scanf: remove redundant debug logs" commit message. (Andy
  Shevchenko)
- Add patch "implicate test line in failure messages".
- Rebase on linux-next, move scanf_kunit.c into lib/tests/.
- Link to v7: https://lore.kernel.org/r/20250211-scanf-kunit-convert-v7-0-c057f0a3d9d8@gmail.com

Changes in v7:
- Remove redundant debug logs. (Petr Mladek)
- Drop Petr's Acked-by.
- Use original test assertions as KUNIT_*_EQ_MSG produces hard-to-parse
  messages. The new failure output is:
- Link to v6: https://lore.kernel.org/r/20250210-scanf-kunit-convert-v6-0-4d583d07f92d@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 (6):
      scanf: implicate test line in failure messages
      scanf: remove redundant debug logs
      scanf: convert self-test to KUnit
      scanf: break kunit into test cases
      scanf: tidy header `#include`s
      scanf: further break kunit into test cases

 MAINTAINERS                               |   2 +-
 lib/Kconfig.debug                         |  12 +-
 lib/Makefile                              |   1 -
 lib/tests/Makefile                        |   1 +
 lib/{test_scanf.c => tests/scanf_kunit.c} | 360 ++++++++++++++++--------------
 tools/testing/selftests/lib/Makefile      |   2 +-
 tools/testing/selftests/lib/config        |   1 -
 tools/testing/selftests/lib/scanf.sh      |   4 -
 8 files changed, 201 insertions(+), 182 deletions(-)
---
base-commit: 7ec162622e66a4ff886f8f28712ea1b13069e1aa
change-id: 20250131-scanf-kunit-convert-f70dc33bb34c

Best regards,