tools/bpftool: Auto-detect split BTFs in common cases
In case of working with module's split BTF from /sys/kernel/btf/*, auto-substitute /sys/kernel/btf/vmlinux as the base BTF. This makes using bpftool with module BTFs faster and simpler. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20201202065244.530571-4-andrii@kernel.org
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