kunit: update documentation to describe module-based build

Documentation should describe how to build kunit and tests as

Co-developed-by: Knut Omang <knut.omang@oracle.com>
Signed-off-by: Knut Omang <knut.omang@oracle.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Upstream-v5.6-SHA1: 6ae2bfd3df06b59aa1b15e25b9656900b15a8880
diff --git a/Documentation/dev-tools/kunit/faq.rst b/Documentation/dev-tools/kunit/faq.rst
index bf20951..ea55b24 100644
--- a/Documentation/dev-tools/kunit/faq.rst
+++ b/Documentation/dev-tools/kunit/faq.rst
@@ -29,7 +29,8 @@
 For the most part, the KUnit core framework (what you use to write the tests)
 can compile to any architecture; it compiles like just another part of the
-kernel and runs when the kernel boots. However, there is some infrastructure,
+kernel and runs when the kernel boots, or when built as a module, when the
+module is loaded.  However, there is some infrastructure,
 like the KUnit Wrapper (``tools/testing/kunit/kunit.py``) that does not support
 other architectures.
diff --git a/Documentation/dev-tools/kunit/index.rst b/Documentation/dev-tools/kunit/index.rst
index c60d760..d16a4d2 100644
--- a/Documentation/dev-tools/kunit/index.rst
+++ b/Documentation/dev-tools/kunit/index.rst
@@ -49,6 +49,9 @@
 of a host operating system; to be clear, it does not require any virtualization
 support; it is just a regular program.
+Alternatively, kunit and kunit tests can be built as modules and tests will
+run when the test module is loaded.
 KUnit is fast. Excluding build time, from invocation to completion KUnit can run
 several dozen tests in only 10 to 20 seconds; this might not sound like a big
 deal to some people, but having such fast and easy to run tests fundamentally
diff --git a/Documentation/dev-tools/kunit/usage.rst b/Documentation/dev-tools/kunit/usage.rst
index b9a065a..7cd56a1 100644
--- a/Documentation/dev-tools/kunit/usage.rst
+++ b/Documentation/dev-tools/kunit/usage.rst
@@ -539,6 +539,22 @@
 Congratulations, you just ran a KUnit test on the x86 architecture!
+In a similar manner, kunit and kunit tests can also be built as modules,
+so if you wanted to run tests in this way you might add the following config
+options to your ``.config``:
+.. code-block:: none
+Once the kernel is built and installed, a simple
+.. code-block:: bash
+	modprobe example-test
+...will run the tests.
 Writing new tests for other architectures