netdev - Re: [PATCH v3 02/15] kunit: bug: Count suppressed warning backtraces

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Message-ID: <CABVgOSmib5PSr2ZJh+oXxk55eqitw6SdgLne3X-Ua6A3fihP-g@mail.gmail.com>
Date: Tue, 9 Apr 2024 16:29:35 +0800
From: David Gow <davidgow@...gle.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: linux-kselftest@...r.kernel.org, David Airlie <airlied@...il.com>, 
	Arnd Bergmann <arnd@...db.de>, Maíra Canal <mcanal@...lia.com>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Kees Cook <keescook@...omium.org>, 
	Daniel Diaz <daniel.diaz@...aro.org>, Arthur Grillo <arthurgrillo@...eup.net>, 
	Brendan Higgins <brendan.higgins@...ux.dev>, Naresh Kamboju <naresh.kamboju@...aro.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Maxime Ripard <mripard@...nel.org>, 
	Ville Syrjälä <ville.syrjala@...ux.intel.com>, 
	Daniel Vetter <daniel@...ll.ch>, Thomas Zimmermann <tzimmermann@...e.de>, dri-devel@...ts.freedesktop.org, 
	kunit-dev@...glegroups.com, linux-arch@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org, 
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org, 
	loongarch@...ts.linux.dev, netdev@...r.kernel.org, x86@...nel.org, 
	Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: [PATCH v3 02/15] kunit: bug: Count suppressed warning backtraces

On Wed, 3 Apr 2024 at 21:19, Guenter Roeck <linux@...ck-us.net> wrote:
>
> 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 <dan.carpenter@...aro.org>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Tested-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---

Looks good to me, thanks.

Reviewed-by: David Gow <davidgow@...gle.com>

Cheers,
-- David


> v2:
> - Rebased to v6.9-rc1
> - Added Tested-by:, Acked-by:, and Reviewed-by: tags
> - Introduced KUNIT_SUPPRESS_BACKTRACE configuration option
> v3:
> - Rebased to v6.9-rc2
>
>  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 bd0fe047572b..72e9fb23bbd5 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 __start_suppress_warning(struct __suppressed_warning *warning);
> @@ -28,7 +29,7 @@ bool __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 START_SUPPRESSED_WARNING(func) \
>         __start_suppress_warning(&__kunit_suppress_##func)
> @@ -39,12 +40,16 @@ bool __is_suppressed_warning(const char *function);
>  #define IS_SUPPRESSED_WARNING(func) \
>         __is_suppressed_warning(func)
>
> +#define SUPPRESSED_WARNING_COUNT(func) \
> +       (__kunit_suppress_##func.counter)
> +
>  #else /* CONFIG_KUNIT_SUPPRESS_BACKTRACE */
>
>  #define DEFINE_SUPPRESSED_WARNING(func)
>  #define START_SUPPRESSED_WARNING(func)
>  #define END_SUPPRESSED_WARNING(func)
>  #define 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 f93544d7a9d1..13b3d896c114 100644
> --- a/lib/kunit/bug.c
> +++ b/lib/kunit/bug.c
> @@ -32,8 +32,10 @@ bool __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;
>  }
> --
> 2.39.2
>
> --
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