On Thu, 13 Mar 2025 at 19:44, Alessandro Carminati wrote:
>
> From: Guenter Roeck
>
> Count suppressed warning backtraces to enable code which suppresses
> warning backtraces to check if the expected backtrace(s) have been
> observed.
>
> Using atomics for the backtrace count resulted in build errors on some
> architectures due to include file recursion, so use a plain integer
> for now.
>
> Acked-by: Dan Carpenter
> Reviewed-by: Kees Cook
> Tested-by: Linux Kernel Functional Testing
> Signed-off-by: Guenter Roeck
> Reviewed-by: David Gow
> Signed-off-by: Alessandro Carminati
> ---
Looks good. I'd definitely prefer the atomics to work one day, but I
doubt we're likely to have backtraces from multiple threads happening
in a KUnit test, so it's definitely not urgent.
Reviewed-by: David Gow
Cheers,
-- David
> include/kunit/bug.h | 7 ++-
> lib/kunit/bug.c | 4 +++-
> 2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/include/kunit/bug.h b/include/kunit/bug.h
> index 0a8e62c1fcaf..44efa7d5c902 100644
> --- a/include/kunit/bug.h
> +++ b/include/kunit/bug.h
> @@ -20,6 +20,7 @@
> struct __suppressed_warning {
> struct list_head node;
> const char *function;
> + int counter;
> };
>
> void __kunit_start_suppress_warning(struct __suppressed_warning *warning);
> @@ -28,7 +29,7 @@ bool __kunit_is_suppressed_warning(const char *function);
>
> #define DEFINE_SUPPRESSED_WARNING(func)\
> struct __suppressed_warning __kunit_suppress_##func = \
> - { .function = __stringify(func) }
> + { .function = __stringify(func), .counter = 0 }
>
> #define KUNIT_START_SUPPRESSED_WARNING(func) \
> __kunit_start_suppress_warning(&__kunit_suppress_##func)
> @@ -39,12 +40,16 @@ bool __kunit_is_suppressed_warning(const char *function);
> #define KUNIT_IS_SUPPRESSED_WARNING(func) \
> __kunit_is_suppressed_warning(func)
>
> +#define SUPPRESSED_WARNING_COUNT(func) \
> + (__kunit_suppress_##func.counter)
> +
> #else /* CONFIG_KUNIT_SUPPRESS_BACKTRACE */
>
> #define DEFINE_SUPPRESSED_WARNING(func)
> #define KUNIT_START_SUPPRESSED_WARNING(func)
> #define KUNIT_END_SUPPRESSED_WARNING(func)
> #define KUNIT_IS_SUPPRESSED_WARNING(func) (false)
> +#define SUPPRESSED_WARNING_COUNT(func) (0)
>
> #endif /* CONFIG_KUNIT_SUPPRESS_BACKTRACE */
> #endif /* __ASSEMBLY__ */
> diff --git a/lib/kunit/bug.c b/lib/kunit/bug.c
> index 351f9a595a71..84c05b1a9e8b 100644
> --- a/lib/kunit/bug.c
> +++ b/lib/kunit/bug.c
> @@ -32,8 +32,10 @@ bool __kunit_is_suppressed_warning(const char *function)
> return false;
>
> list_for_each_entry(warning, &suppressed_warnings, node) {
> - if (!strcmp(function, warning->function))
> + if (!strcmp(function, warning->function)) {
> + warning->counter++;
> return true;
> + }
> }
> return false;
> }
> --
> 2.34.1
>
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