tools, bpftool: Print correct error message when failing to load BTF
btf__parse_raw and btf__parse_elf return negative error numbers wrapped in an ERR_PTR, so the extracted value needs to be negated before passing them to strerror which expects a positive error number. Before: Error: failed to load BTF from .../vmlinux: Unknown error -2 After: Error: failed to load BTF from .../vmlinux: No such file or directory Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200525135421.4154-1-tklauser@distanz.ch Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -553,7 +553,7 @@ static int do_dump(int argc, char **argv)
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btf = btf__parse_elf(*argv, NULL);
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if (IS_ERR(btf)) {
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err = PTR_ERR(btf);
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err = -PTR_ERR(btf);
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btf = NULL;
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p_err("failed to load BTF from %s: %s",
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*argv, strerror(err));
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