Documentation: KUnit: Update the instructions on how to test static functions

Now that we have the VISIBLE_IF_KUNIT and EXPORT_SYMBOL_IF_KUNIT macros,
update the instructions to recommend this way of testing static
functions.

Signed-off-by: Arthur Grillo <arthurgrillo@riseup.net>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/Documentation/dev-tools/kunit/usage.rst b/Documentation/dev-tools/kunit/usage.rst
index a9efab50eed83e06a89549aeb1fb4da1b2eba1d9..22955d56b3799bfc3f3b92874b638aa24c1edaa6 100644 (file)
--- a/Documentation/dev-tools/kunit/usage.rst
+++ b/Documentation/dev-tools/kunit/usage.rst
@@ -671,8 +671,23 @@ Testing Static Functions
 ------------------------
 
 If we do not want to expose functions or variables for testing, one option is to
-conditionally ``#include`` the test file at the end of your .c file. For
-example:
+conditionally export the used symbol. For example:
+
+.. code-block:: c
+
+       /* In my_file.c */
+
+       VISIBLE_IF_KUNIT int do_interesting_thing();
+       EXPORT_SYMBOL_IF_KUNIT(do_interesting_thing);
+
+       /* In my_file.h */
+
+       #if IS_ENABLED(CONFIG_KUNIT)
+               int do_interesting_thing(void);
+       #endif
+
+Alternatively, you could conditionally ``#include`` the test file at the end of
+your .c file. For example:
 
 .. code-block:: c