selftests/bpf: Switch fexit_bpf2bpf selftest to set_attach_target() API
Switch fexit_bpf2bpf selftest to bpf_program__set_attach_target() instead of using bpf_object_open_opts.attach_prog_fd, which is going to be deprecated. These changes also demonstrate the new mode of set_attach_target() in which it allows NULL when the target is BPF program (attach_prog_fd != 0). Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210916015836.1248906-6-andrii@kernel.org
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