Date:   Tue, 18 Oct 2022 14:01:31 +0800
From:   David Gow <davidgow@...gle.com>
To:     Sadiya Kazi <sadiyakazi@...gle.com>
Cc:     brendanhiggins@...gle.com, skhan@...uxfoundation.org,
        corbet@....net, bagasdotme@...il.com,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] Documentation: Kunit: Update architecture.rst for
 minor fixes

On Tue, Oct 18, 2022 at 12:04 PM 'Sadiya Kazi' via KUnit Development
<kunit-dev@...glegroups.com> wrote:
>
> Updated the architecture.rst page with the following changes:
> -Add missing article _the_ across the document.
> -Reword content across for style and standard.
> -Update all occurrences of Command Line to Command-line
>  across the document.
> -Correct grammatical issues, for example,
>  added _it_wherever missing.
> -Update all occurrences of “via" to either use
>  “through” or “using”.
> -Update the text preceding the external links and pushed the full
>  link to a new line for better readability.
> -Reword content under the config command to make it more clear and concise.
>
> Signed-off-by: Sadiya Kazi <sadiyakazi@...gle.com>
> Reviewed-by: David Gow <davidgow@...gle.com>
> ---

Thanks -- this looks good to me. Assuming nothing goes wrong, it
should be in 6.2.

Cheers,
-- David

> Thank you David. I have made the changes as per your feedback.
> Changes since V3:
> https://lore.kernel.org/linux-kselftest/20221017070820.2253501-1-sadiyakazi@google.com/
>
> - Added the missing full stop
> - Reworded content around the ``kunit_try_catch_run()`` funtion
>
> Regards,
> Sadiya
>
> ---
>  .../dev-tools/kunit/architecture.rst          | 115 +++++++++---------
>  1 file changed, 58 insertions(+), 57 deletions(-)
>
> diff --git a/Documentation/dev-tools/kunit/architecture.rst b/Documentation/dev-tools/kunit/architecture.rst
> index 8efe792bdcb9..e95ab05342bb 100644
> --- a/Documentation/dev-tools/kunit/architecture.rst
> +++ b/Documentation/dev-tools/kunit/architecture.rst
> @@ -4,16 +4,17 @@
>  KUnit Architecture
>  ==================
>
> -The KUnit architecture can be divided into two parts:
> +The KUnit architecture is divided into two parts:
>
>  - `In-Kernel Testing Framework`_
> -- `kunit_tool (Command Line Test Harness)`_
> +- `kunit_tool (Command-line Test Harness)`_
>
>  In-Kernel Testing Framework
>  ===========================
>
>  The kernel testing library supports KUnit tests written in C using
> -KUnit. KUnit tests are kernel code. KUnit does several things:
> +KUnit. These KUnit tests are kernel code. KUnit performs the following
> +tasks:
>
>  - Organizes tests
>  - Reports test results
> @@ -22,19 +23,17 @@ KUnit. KUnit tests are kernel code. KUnit does several things:
>  Test Cases
>  ----------
>
> -The fundamental unit in KUnit is the test case. The KUnit test cases are
> -grouped into KUnit suites. A KUnit test case is a function with type
> -signature ``void (*)(struct kunit *test)``.
> -These test case functions are wrapped in a struct called
> -struct kunit_case.
> +The test case is the fundamental unit in KUnit. KUnit test cases are organised
> +into suites. A KUnit test case is a function with type signature
> +``void (*)(struct kunit *test)``. These test case functions are wrapped in a
> +struct called struct kunit_case.
>
>  .. note:
>         ``generate_params`` is optional for non-parameterized tests.
>
> -Each KUnit test case gets a ``struct kunit`` context
> -object passed to it that tracks a running test. The KUnit assertion
> -macros and other KUnit utilities use the ``struct kunit`` context
> -object. As an exception, there are two fields:
> +Each KUnit test case receives a ``struct kunit`` context object that tracks a
> +running test. The KUnit assertion macros and other KUnit utilities use the
> +``struct kunit`` context object. As an exception, there are two fields:
>
>  - ``->priv``: The setup functions can use it to store arbitrary test
>    user data.
> @@ -77,12 +76,13 @@ Executor
>
>  The KUnit executor can list and run built-in KUnit tests on boot.
>  The Test suites are stored in a linker section
> -called ``.kunit_test_suites``. For code, see:
> -https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/asm-generic/vmlinux.lds.h?h=v5.15#n945.
> +called ``.kunit_test_suites``. For the code, see ``KUNIT_TABLE()`` macro
> +definition in
> +`include/asm-generic/vmlinux.lds.h <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/asm-generic/vmlinux.lds.h?h=v6.0#n950>`_.
>  The linker section consists of an array of pointers to
>  ``struct kunit_suite``, and is populated by the ``kunit_test_suites()``
> -macro. To run all tests compiled into the kernel, the KUnit executor
> -iterates over the linker section array.
> +macro. The KUnit executor iterates over the linker section array in order to
> +run all the tests that are compiled into the kernel.
>
>  .. kernel-figure:: kunit_suitememorydiagram.svg
>         :alt:   KUnit Suite Memory
> @@ -90,17 +90,17 @@ iterates over the linker section array.
>         KUnit Suite Memory Diagram
>
>  On the kernel boot, the KUnit executor uses the start and end addresses
> -of this section to iterate over and run all tests. For code, see:
> -https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/lib/kunit/executor.c
> -
> +of this section to iterate over and run all tests. For the implementation of the
> +executor, see
> +`lib/kunit/executor.c <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/lib/kunit/executor.c>`_.
>  When built as a module, the ``kunit_test_suites()`` macro defines a
>  ``module_init()`` function, which runs all the tests in the compilation
>  unit instead of utilizing the executor.
>
>  In KUnit tests, some error classes do not affect other tests
>  or parts of the kernel, each KUnit case executes in a separate thread
> -context. For code, see:
> -https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/lib/kunit/try-catch.c?h=v5.15#n58
> +context. See the ``kunit_try_catch_run()`` function in
> +`lib/kunit/try-catch.c <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/lib/kunit/try-catch.c?h=v5.15#n58>`_.
>
>  Assertion Macros
>  ----------------
> @@ -111,37 +111,36 @@ All expectations/assertions are formatted as:
>
>  - ``{EXPECT|ASSERT}`` determines whether the check is an assertion or an
>    expectation.
> +  In the event of a failure, the testing flow differs as follows:
>
> -       - For an expectation, if the check fails, marks the test as failed
> -         and logs the failure.
> +       - For expectations, the test is marked as failed and the failure is logged.
>
> -       - An assertion, on failure, causes the test case to terminate
> -         immediately.
> +       - Failing assertions, on the other hand, result in the test case being
> +         terminated immediately.
>
> -               - Assertions call function:
> +               - Assertions call the function:
>                   ``void __noreturn kunit_abort(struct kunit *)``.
>
> -               - ``kunit_abort`` calls function:
> +               - ``kunit_abort`` calls the function:
>                   ``void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)``.
>
> -               - ``kunit_try_catch_throw`` calls function:
> +               - ``kunit_try_catch_throw`` calls the function:
>                   ``void kthread_complete_and_exit(struct completion *, long) __noreturn;``
>                   and terminates the special thread context.
>
>  - ``<op>`` denotes a check with options: ``TRUE`` (supplied property
> -  has the boolean value “true”), ``EQ`` (two supplied properties are
> +  has the boolean value "true"), ``EQ`` (two supplied properties are
>    equal), ``NOT_ERR_OR_NULL`` (supplied pointer is not null and does not
> -  contain an “err” value).
> +  contain an "err" value).
>
>  - ``[_MSG]`` prints a custom message on failure.
>
>  Test Result Reporting
>  ---------------------
> -KUnit prints test results in KTAP format. KTAP is based on TAP14, see:
> -https://github.com/isaacs/testanything.github.io/blob/tap14/tap-version-14-specification.md.
> -KTAP (yet to be standardized format) works with KUnit and Kselftest.
> -The KUnit executor prints KTAP results to dmesg, and debugfs
> -(if configured).
> +KUnit prints the test results in KTAP format. KTAP is based on TAP14, see
> +Documentation/dev-tools/ktap.rst.
> +KTAP works with KUnit and Kselftest. The KUnit executor prints KTAP results to
> +dmesg, and debugfs (if configured).
>
>  Parameterized Tests
>  -------------------
> @@ -150,33 +149,35 @@ Each KUnit parameterized test is associated with a collection of
>  parameters. The test is invoked multiple times, once for each parameter
>  value and the parameter is stored in the ``param_value`` field.
>  The test case includes a KUNIT_CASE_PARAM() macro that accepts a
> -generator function.
> -The generator function is passed the previous parameter and returns the next
> -parameter. It also provides a macro to generate common-case generators based on
> -arrays.
> +generator function. The generator function is passed the previous parameter
> +and returns the next parameter. It also includes a macro for generating
> +array-based common-case generators.
>
> -kunit_tool (Command Line Test Harness)
> +kunit_tool (Command-line Test Harness)
>  ======================================
>
> -kunit_tool is a Python script ``(tools/testing/kunit/kunit.py)``
> -that can be used to configure, build, exec, parse and run (runs other
> -commands in order) test results. You can either run KUnit tests using
> -kunit_tool or can include KUnit in kernel and parse manually.
> +``kunit_tool`` is a Python script, found in ``tools/testing/kunit/kunit.py``. It
> +is used to configure, build, execute, parse test results and run all of the
> +previous commands in correct order (i.e., configure, build, execute and parse).
> +You have two options for running KUnit tests: either build the kernel with KUnit
> +enabled and manually parse the results (see
> +Documentation/dev-tools/kunit/run_manual.rst) or use ``kunit_tool``
> +(see Documentation/dev-tools/kunit/run_wrapper.rst).
>
>  - ``configure`` command generates the kernel ``.config`` from a
>    ``.kunitconfig`` file (and any architecture-specific options).
> -  For some architectures, additional config options are specified in the
> -  ``qemu_config`` Python script
> -  (For example: ``tools/testing/kunit/qemu_configs/powerpc.py``).
> +  The Python scripts available in ``qemu_configs`` folder
> +  (for example, ``tools/testing/kunit/qemu configs/powerpc.py``) contains
> +  additional configuration options for specific architectures.
>    It parses both the existing ``.config`` and the ``.kunitconfig`` files
> -  and ensures that ``.config`` is a superset of ``.kunitconfig``.
> -  If this is not the case, it will combine the two and run
> -  ``make olddefconfig`` to regenerate the ``.config`` file. It then
> -  verifies that ``.config`` is now a superset. This checks if all
> -  Kconfig dependencies are correctly specified in ``.kunitconfig``.
> -  ``kunit_config.py`` includes the parsing Kconfigs code. The code which
> -  runs ``make olddefconfig`` is a part of ``kunit_kernel.py``. You can
> -  invoke this command via: ``./tools/testing/kunit/kunit.py config`` and
> +  to ensure that ``.config`` is a superset of ``.kunitconfig``.
> +  If not, it will combine the two and run ``make olddefconfig`` to regenerate
> +  the ``.config`` file. It then checks to see if ``.config`` has become a superset.
> +  This verifies that all the Kconfig dependencies are correctly specified in the
> +  file ``.kunitconfig``. The ``kunit_config.py`` script contains the code for parsing
> +  Kconfigs. The code which runs ``make olddefconfig`` is part of the
> +  ``kunit_kernel.py`` script. You can invoke this command through:
> +  ``./tools/testing/kunit/kunit.py config`` and
>    generate a ``.config`` file.
>  - ``build`` runs ``make`` on the kernel tree with required options
>    (depends on the architecture and some options, for example: build_dir)
> @@ -184,8 +185,8 @@ kunit_tool or can include KUnit in kernel and parse manually.
>    To build a KUnit kernel from the current ``.config``, you can use the
>    ``build`` argument: ``./tools/testing/kunit/kunit.py build``.
>  - ``exec`` command executes kernel results either directly (using
> -  User-mode Linux configuration), or via an emulator such
> -  as QEMU. It reads results from the log via standard
> +  User-mode Linux configuration), or through an emulator such
> +  as QEMU. It reads results from the log using standard
>    output (stdout), and passes them to ``parse`` to be parsed.
>    If you already have built a kernel with built-in KUnit tests,
>    you can run the kernel and display the test results with the ``exec``
> --
> 2.38.0.413.g74048e4d9e-goog
>
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