[PATCH] Documentation: KUnit: Update filename best practices

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Based on feedback from Linus[1], change the suggested file naming for
KUnit tests.

Link: https://lore.kernel.org/lkml/CAHk-=wgim6pNiGTBMhP8Kd3tsB7_JTAuvNJ=XYd3wPvvk=OHog@xxxxxxxxxxxxxx/ [1]
Signed-off-by: Kees Cook <kees@xxxxxxxxxx>
---
Cc: David Gow <davidgow@xxxxxxxxxx>
Cc: Brendan Higgins <brendan.higgins@xxxxxxxxx>
Cc: Rae Moar <rmoar@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Cc: kunit-dev@xxxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
---
 Documentation/dev-tools/kunit/style.rst | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/Documentation/dev-tools/kunit/style.rst b/Documentation/dev-tools/kunit/style.rst
index b6d0d7359f00..761dee3f89ca 100644
--- a/Documentation/dev-tools/kunit/style.rst
+++ b/Documentation/dev-tools/kunit/style.rst
@@ -188,15 +188,20 @@ For example, a Kconfig entry might look like:
 Test File and Module Names
 ==========================
 
-KUnit tests can often be compiled as a module. These modules should be named
-after the test suite, followed by ``_test``. If this is likely to conflict with
-non-KUnit tests, the suffix ``_kunit`` can also be used.
-
-The easiest way of achieving this is to name the file containing the test suite
-``<suite>_test.c`` (or, as above, ``<suite>_kunit.c``). This file should be
-placed next to the code under test.
+Whether a KUnit test is compiled as a separate module or via an
+``#include`` in a core kernel source file, the files should be named
+after the test suite, followed by ``_test``, and live in a ``tests``
+subdirectory to avoid conflicting with regular modules or the core kernel
+source file names (e.g. for tab-completion). If this would conflict with
+non-KUnit tests, the suffix ``_kunit`` can be used instead.
+
+So for the common case, name the file containing the test suite
+``tests/<suite>_test.c`` (or, if needed, ``tests/<suite>_kunit.c``). The
+``tests`` directory should be placed at the same level as the
+code under test. For example, tests for ``lib/string.c`` live in
+``lib/tests/string_test.c``.
 
 If the suite name contains some or all of the name of the test's parent
 directory, it may make sense to modify the source filename to reduce redundancy.
-For example, a ``foo_firmware`` suite could be in the ``foo/firmware_test.c``
+For example, a ``foo_firmware`` suite could be in the ``tests/foo/firmware_test.c``
 file.
-- 
2.34.1





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