[PATCH v4 linux-kselftest-test 6/6] kunit: update documentation to describe module-based build

[Alan Maguire]

Documentation should describe how to build kunit and tests as
modules.

Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
Signed-off-by: Knut Omang <knut.omang@xxxxxxxxxx>
---
 Documentation/dev-tools/kunit/faq.rst   |  3 ++-
 Documentation/dev-tools/kunit/index.rst |  3 +++
 Documentation/dev-tools/kunit/usage.rst | 16 ++++++++++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)

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 @@ Yes, well, mostly.
 
 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 26ffb46..7ddc385 100644
--- a/Documentation/dev-tools/kunit/index.rst
+++ b/Documentation/dev-tools/kunit/index.rst
@@ -48,6 +48,9 @@ to a standalone program that can be run like any other program directly inside
 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 c6e6963..82f9213 100644
--- a/Documentation/dev-tools/kunit/usage.rst
+++ b/Documentation/dev-tools/kunit/usage.rst
@@ -539,6 +539,22 @@ Interspersed in the kernel logs you might see the following:
 
 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
+
+	CONFIG_KUNIT=m
+	CONFIG_KUNIT_EXAMPLE_TEST=m
+
+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
 -----------------------------------------
 
-- 
1.8.3.1