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tools, bpftool: Print correct error message when failing to load BTF

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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>
This commit is contained in:
Tobias Klauser 2020-05-25 15:54:21 +02:00 committed by Alexei Starovoitov
parent 73a4f0407e
commit dc3ca5cf3e
1 changed files with 1 additions and 1 deletions
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2
tools/bpf/bpftool/btf.c
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@ -553,7 +553,7 @@ static int do_dump(int argc, char **argv)
btf = btf__parse_elf(*argv, NULL);
if (IS_ERR(btf)) {
err = PTR_ERR(btf);
err = -PTR_ERR(btf);
btf = NULL;
p_err("failed to load BTF from %s: %s",
*argv, strerror(err));