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Four test cases are added: > (1) attach dummy_st_ops should fail > (2) function return value of bpf_dummy_ops::test_1() is expected > (3) pointer argument of bpf_dummy_ops::test_1() works as expected > (4) multiple arguments passed to bpf_dummy_ops::test_2() are correct Acked-by: Martin KaFai Lau