linux-kernel - Re: [PATCH 2/2] kunit: add coverage

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Date:   Fri, 24 Jun 2022 15:55:45 +0800
From:   David Gow <davidgow@...gle.com>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        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>
Subject: Re: [PATCH 2/2] kunit: add coverage_uml.config to enable GCOV on UML

On Fri, Jun 24, 2022 at 8:12 AM 'Daniel Latypov' via KUnit Development
<kunit-dev@...glegroups.com> wrote:
>
> Now that kunit.py's --kunitconfig is repeatable, let's create a file to
> hold the various options needed to enable coverage under UML.
>
> This can be used like so:
> $ ./tools/testing/kunit/kunit.py run \
>   --kunitconfig=tools/testing/kunit/configs/all_tests_uml.config \
>   --kunitconfig=tools/testing/kunit/configs/coverage_uml.config \
>   --make_options=CC=/usr/bin/gcc-6
>
> which on my system is enough to get coverage working [1].
>
> This is still a clunky command, but far better than before.
>
> [1] at the time of this commit, I get:
>   Overall coverage rate:
>     lines......: 11.6% (34112 of 295033 lines)
>     functions..: 15.3% (3721 of 24368 functions)
>
> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
> ---

Looks good to me: depending on whether or not we do something like
[1], we should add a pci_uml.config as well.

Alas, I don't have a working gcc 6 install anymore, so I wasn't able
to test the coverage here, but I at least got an encouraging-looking
error, and the change looks very sensible, so:

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

Cheers,
-- David

[1] https://lore.kernel.org/linux-kselftest/20220622035326.759935-1-davidgow@google.com/


>  Documentation/dev-tools/kunit/running_tips.rst  |  3 +--
>  tools/testing/kunit/configs/coverage_uml.config | 11 +++++++++++
>  2 files changed, 12 insertions(+), 2 deletions(-)
>  create mode 100644 tools/testing/kunit/configs/coverage_uml.config
>
> diff --git a/Documentation/dev-tools/kunit/running_tips.rst b/Documentation/dev-tools/kunit/running_tips.rst
> index c36f6760087d..205ea21c9cca 100644
> --- a/Documentation/dev-tools/kunit/running_tips.rst
> +++ b/Documentation/dev-tools/kunit/running_tips.rst
> @@ -123,8 +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_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y\nCONFIG_GCOV=y" >> .kunit/.kunitconfig
> -       $ ./tools/testing/kunit/kunit.py run
> +       $ ./tools/testing/kunit/kunit.py run --kunitconfig=.kunit/ --kunitconfig=tools/testing/kunit/configs/coverage_uml.config
>         # Extract the coverage information from the build dir (.kunit/)
>         $ lcov -t "my_kunit_tests" -o coverage.info -c -d .kunit/
>
> diff --git a/tools/testing/kunit/configs/coverage_uml.config b/tools/testing/kunit/configs/coverage_uml.config
> new file mode 100644
> index 000000000000..bacb77664fa8
> --- /dev/null
> +++ b/tools/testing/kunit/configs/coverage_uml.config
> @@ -0,0 +1,11 @@
> +# This config fragment enables coverage on UML, which is different from the
> +# normal gcov used in other arches (no debugfs).
> +# Example usage:
> +# ./tools/testing/kunit/kunit.py run \
> +#   --kunitconfig=tools/testing/kunit/configs/all_tests_uml.config \
> +#   --kunitconfig=tools/testing/kunit/configs/coverage_uml.config
> +
> +CONFIG_DEBUG_KERNEL=y
> +CONFIG_DEBUG_INFO=y
> +CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
> +CONFIG_GCOV=y
> --
> 2.37.0.rc0.104.g0611611a94-goog
>
> --
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