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SubjectRe: [PATCH 1/2] kunit: Expose 'static stub' API to redirect functions
On Thu, Dec 8, 2022 at 1:18 AM 'David Gow' via KUnit Development
<> wrote:
> Add a simple way of redirecting calls to functions by including a
> special prologue in the "real" function which checks to see if the
> replacement function should be called (and, if so, calls it).
> To redirect calls to a function, make the first (non-declaration) line
> of the function:
> KUNIT_STATIC_STUB_REDIRECT(function_name, [function arguments]);
> (This will compile away to nothing if KUnit is not enabled, otherwise it
> will check if a redirection is active, call the replacement function,
> and return. This check is protected by a static branch, so has very
> little overhead when there are no KUnit tests running.)
> Calls to the real function can be redirected to a replacement using:
> kunit_activate_static_stub(test, real_fn, replacement_fn);
> The redirection will only affect calls made from within the kthread of
> the current test, and will be automatically disabled when the test
> completes. It can also be manually disabled with
> kunit_deactivate_static_stub().
> The 'example' KUnit test suite has a more complete example.
> Co-developed-by: Daniel Latypov <>
> Signed-off-by: Daniel Latypov <>
> Signed-off-by: David Gow <>

Reviewed-by: Brendan Higgins <>

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