Re: [PATCH 0/9] kunit: Fix printf format specifier issues in KUnit assertions

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On 2/21/24 02:27, David Gow wrote:
KUnit has several macros which accept a log message, which can contain
printf format specifiers. Some of these (the explicit log macros)
already use the __printf() gcc attribute to ensure the format specifiers
are valid, but those which could fail the test, and hence used
__kunit_do_failed_assertion() behind the scenes, did not.

These include:
- KUNIT_EXPECT_*_MSG()
- KUNIT_ASSERT_*_MSG()
- KUNIT_FAIL()

This series adds the __printf() attribute, and fixes all of the issues
uncovered. (Or, at least, all of those I could find with an x86_64
allyesconfig, and the default KUnit config on a number of other
architectures. Please test!)

The issues in question basically take the following forms:
- int / long / long long confusion: typically a type being updated, but
   the format string not.
- Use of integer format specifiers (%d/%u/%li/etc) for types like size_t
   or pointer differences (technically ptrdiff_t), which would only work
   on some architectures.
- Use of integer format specifiers in combination with PTR_ERR(), where
   %pe would make more sense.
- Use of empty messages which, whilst technically not incorrect, are not
   useful and trigger a gcc warning.

We'd like to get these (or equivalent) in for 6.9 if possible, so please
do take a look if possible.

Thanks,
-- David

Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Closes: https://lore.kernel.org/linux-kselftest/CAHk-=wgJMOquDO5f8ShH1f4rzZwzApNVCw643m5-Yj+BfsFstA@xxxxxxxxxxxxxx/



Thank you for a quick response David. I will apply the series to
kunit next for Linux 6.9 as soon as the reviews are complete.

thanks,
-- Shuah




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