linux-kernel - [PATCH v2 3/8] Documentation: KUnit: add note about mrproper in start.rst

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Date:   Sun, 21 Aug 2022 23:26:41 -0300
From:   Tales Aparecida <tales.aparecida@...il.com>
To:     Sadiya Kazi <sadiyakazi@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        davidgow@...gle.com, corbet@....net, brendan.higgins@...ux.dev,
        Trevor Woerner <twoerner@...il.com>, siqueirajordao@...eup.net,
        mwen@...lia.com, andrealmeid@...eup.net, mairacanal@...eup.net,
        Isabella Basso <isabbasso@...eup.net>, magalilemes00@...il.com,
        tales.aparecida@...il.com
Subject: [PATCH v2 3/8] Documentation: KUnit: add note about mrproper in start.rst

The "Getting Started" guide should be beginner-friendly, therefore
add a note about the requirement of a clean source tree when running
kunit_tool for the first time, and its related error.

Signed-off-by: Tales Aparecida <tales.aparecida@...il.com>

---
Notes:
    Edit note following suggestions (Sadiya Kazi)
---
 Documentation/dev-tools/kunit/start.rst | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/dev-tools/kunit/start.rst b/Documentation/dev-tools/kunit/start.rst
index 2e31350a85e1..9beec7d6ac4b 100644
--- a/Documentation/dev-tools/kunit/start.rst
+++ b/Documentation/dev-tools/kunit/start.rst
@@ -19,6 +19,22 @@ can run kunit_tool:
 
 	./tools/testing/kunit/kunit.py run
 
+.. note ::
+	You may see the following error:
+	"The source tree is not clean, please run 'make ARCH=um mrproper'"
+
+	This happens because internally kunit.py specifies ``.kunit``
+	(default option) as the build directory in the command ``make O=output/dir``
+	through the argument ``--build_dir``.  Hence, before starting an
+	out-of-tree build, the source tree must be clean.
+
+	There is also the same caveat mentioned in the "Build directory for
+	the kernel" section of the :doc:`admin-guide </admin-guide/README>`,
+	that is, its use, it must be used for all invocations of ``make``.
+	The good news is that it can indeed be solved by running
+	``make ARCH=um mrproper``, just be aware that this will delete the
+	current configuration and all generated files.
+
 If everything worked correctly, you should see the following:
 
 .. code-block::
-- 
2.37.2