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If an application wants to use a ring with different kinds of credentials, it can register them upfront. We don't lookup credentials, the credentials of the task calling IORING_REGISTER_PERSONALITY is used. An 'id' is returned for the application to use in subsequent personality support. Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>