linux-kernel - Re: [PATCH] Documentation: kunit: update kconfig options needed for UML coverage

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Message-ID: <CABVgOSmbQxZmmNtUQLsvMSPkr2FpXB_kdJUUbC=nLrt6xN7e2A@mail.gmail.com>
Date:   Sat, 26 Mar 2022 10:56:01 +0800
From:   David Gow <davidgow@...gle.com>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        KUnit Development <kunit-dev@...glegroups.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>, maxime@...no.tech
Subject: Re: [PATCH] Documentation: kunit: update kconfig options needed for
 UML coverage

On Sat, Mar 26, 2022 at 8:34 AM Daniel Latypov <dlatypov@...gle.com> wrote:
>
> Recent changes have made it so the current set is not sufficient.
> Namely, CONFIG_DEBUG_INFO is not being set even when explicitly asked.
>
> Specifying a version of the debug info fixes this.
> Pick CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT as an option that's
> hopefully less fragile (esp. given we're tied to GCC 6 and lower).
>
> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
> ---

Looks good to me. One idea below, but it's a bit subjective and I'm
fine with this going in as-is if you prefer.

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

Cheers,
-- Daivd

>  Documentation/dev-tools/kunit/running_tips.rst | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/dev-tools/kunit/running_tips.rst b/Documentation/dev-tools/kunit/running_tips.rst
> index 7b6d26a25959..c36f6760087d 100644
> --- a/Documentation/dev-tools/kunit/running_tips.rst
> +++ b/Documentation/dev-tools/kunit/running_tips.rst
> @@ -114,6 +114,7 @@ Instead of enabling ``CONFIG_GCOV_KERNEL=y``, we can set these options:
>
>         CONFIG_DEBUG_KERNEL=y
>         CONFIG_DEBUG_INFO=y
> +       CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
>         CONFIG_GCOV=y
>
>
> @@ -122,7 +123,7 @@ Putting it together into a copy-pastable sequence of commands:
>  .. code-block:: bash
>
>         # Append coverage options to the current config
> -       $ echo -e "CONFIG_DEBUG_KERNEL=y\nCONFIG_DEBUG_INFO=y\nCONFIG_GCOV=y" >> .kunit/.kunitconfig
> +       $ echo -e "CONFIG_DEBUG_KERNEL=y\nCONFIG_DEBUG_INFO=y\nCONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y\nCONFIG_GCOV=y" >> .kunit/.kunitconfig
>         $ ./tools/testing/kunit/kunit.py run

Would we want to instead use a chain of --kconfig_add arguments? (I
think there are advantages either way...)


>         # Extract the coverage information from the build dir (.kunit/)
>         $ lcov -t "my_kunit_tests" -o coverage.info -c -d .kunit/
>
> base-commit: b14ffae378aa1db993e62b01392e70d1e585fb23
> --
> 2.35.1.1021.g381101b075-goog
>