linux/lib/tests/printf_kunit.c, branch v6.15

printf: implicate test line in failure messages

2025-03-13T17:26:33Z

This improves the failure output by pointing to the failing line at the top level of the test, e.g.: # test_number: EXPECTATION FAILED at lib/printf_kunit.c:103 lib/printf_kunit.c:167: vsnprintf(buf, 256, "%#-12x", ...) wrote '0x1234abcd ', expected '0x1234abce ' # test_number: EXPECTATION FAILED at lib/printf_kunit.c:142 lib/printf_kunit.c:167: kvasprintf(..., "%#-12x", ...) returned '0x1234abcd ', expected '0x1234abce ' Signed-off-by: Tamir Duberstein Reviewed-by: Petr Mladek Tested-by: Petr Mladek Link: https://lore.kernel.org/r/20250307-printf-kunit-convert-v6-3-4d85c361c241@gmail.com Signed-off-by: Kees Cook

printf: break kunit into test cases

2025-03-13T17:26:33Z

Move all tests into `printf_test_cases`. This gives us nicer output in the event of a failure. Combine `plain_format` and `plain_hash` into `hash_pointer` since they're testing the same scenario. Signed-off-by: Tamir Duberstein Reviewed-by: Petr Mladek Tested-by: Petr Mladek Link: https://lore.kernel.org/r/20250307-printf-kunit-convert-v6-2-4d85c361c241@gmail.com Signed-off-by: Kees Cook

printf: convert self-test to KUnit

2025-03-13T17:26:33Z

Convert the printf() self-test to a KUnit test. In the interest of keeping the patch reasonably-sized this doesn't refactor the tests into proper parameterized tests - it's all one big test case. Signed-off-by: Tamir Duberstein Reviewed-by: Petr Mladek Tested-by: Petr Mladek Link: https://lore.kernel.org/r/20250307-printf-kunit-convert-v6-1-4d85c361c241@gmail.com Signed-off-by: Kees Cook