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Add a simple test that validates that libbpf will reject isolated struct_ops program early with helpful warning message. Also validate that explicit use of such BPF program through BPF skeleton after BPF object is open won't trigger any warnings. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20240507001335.1445325-7-andrii@kernel.org Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>