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Add kselftest cases for the revocable API. The test consists of three parts: - A kernel module (revocable_test.ko) that creates a debugfs interface with `/provider` and `/consumer` files. - A user-space C program (revocable_test) that uses the kselftest harness to interact with the debugfs files. - An orchestrating shell script (test-revocable.sh) that loads the module, runs the C program, and unloads the module. The test cases cover the following scenarios: - Basic: Verifies that a consumer can successfully access the resource provided via the provider. - Revocation: Verifies that after the provider revokes the resource, the consumer correctly receives a NULL pointer on a subsequent access. - Try Access Macro: Same as "Revocation" but uses the REVOCABLE_TRY_ACCESS_WITH() and REVOCABLE_TRY_ACCESS_SCOPED(). Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org> Link: https://patch.msgid.link/20260116080235.350305-4-tzungbi@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>