Re: [PATCH v2 1/2] libbpf: show error info about missing ".BTF" section

[Andrii Nakryiko]

On Tue, Nov 29, 2022 at 5:42 AM Changbin Du <changbin.du@xxxxxxxxx> wrote:
>
> Show the real problem instead of just saying "No such file or directory".
>
> Now will print below info:
> libbpf: can not find '.BTF' section
> Error: failed to load BTF from /home/changbin/work/linux/vmlinux: No such file or directory
>
> Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
> ---
>  tools/lib/bpf/btf.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
> index d88647da2c7f..1adc0f6019a0 100644
> --- a/tools/lib/bpf/btf.c
> +++ b/tools/lib/bpf/btf.c
> @@ -990,6 +990,7 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
>         err = 0;
>
>         if (!btf_data) {
> +               pr_warn("can not find '%s' section\n", BTF_ELF_SEC);

let's use consistent form of error messages:

pr_warn("failed to find '%s' ELF section in %s\n", BTF_ELF_SEC, path);

>                 err = -ENOENT;
>                 goto done;
>         }
> --
> 2.37.2
>