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Diffstat (limited to 'Documentation/dev-tools/kunit/usage.rst')
| -rw-r--r-- | Documentation/dev-tools/kunit/usage.rst | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/dev-tools/kunit/usage.rst b/Documentation/dev-tools/kunit/usage.rst index c27e1646ecd9..9db12e91668e 100644 --- a/Documentation/dev-tools/kunit/usage.rst +++ b/Documentation/dev-tools/kunit/usage.rst @@ -651,12 +651,16 @@ For example: } Note that, for functions like device_unregister which only accept a single -pointer-sized argument, it's possible to directly cast that function to -a ``kunit_action_t`` rather than writing a wrapper function, for example: +pointer-sized argument, it's possible to automatically generate a wrapper +with the ``KUNIT_DEFINE_ACTION_WRAPPER()`` macro, for example: .. code-block:: C - kunit_add_action(test, (kunit_action_t *)&device_unregister, &dev); + KUNIT_DEFINE_ACTION_WRAPPER(device_unregister, device_unregister_wrapper, struct device *); + kunit_add_action(test, &device_unregister_wrapper, &dev); + +You should do this in preference to manually casting to the ``kunit_action_t`` type, +as casting function pointers will break Control Flow Integrity (CFI). ``kunit_add_action`` can fail if, for example, the system is out of memory. You can use ``kunit_add_action_or_reset`` instead which runs the action |