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kunit: add coverage_uml.config to enable GCOV on UML 

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@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Daniel Latypov 2022-06-27 22:14:46 +00:00 committed by Shuah Khan
parent 8a7c6f859a
commit 1d202d1496
2 changed files with 12 additions and 2 deletions
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3
Documentation/dev-tools/kunit/running_tips.rst
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@ -123,8 +123,7 @@ Putting it together into a copy-pastable sequence of commands:
.. code-block:: bash .. code-block:: bash
# Append coverage options to the current config # 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 --kunitconfig=.kunit/ --kunitconfig=tools/testing/kunit/configs/coverage_uml.config
$ ./tools/testing/kunit/kunit.py run
# Extract the coverage information from the build dir (.kunit/) # Extract the coverage information from the build dir (.kunit/)
$ lcov -t "my_kunit_tests" -o coverage.info -c -d .kunit/ $ lcov -t "my_kunit_tests" -o coverage.info -c -d .kunit/

11
tools/testing/kunit/configs/coverage_uml.config Normal file
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@ -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