Re: [PATCH bpf-next v4 2/2] bpf: Add show_fdinfo for kprobe_multi

[Alexei Starovoitov]

On Thu, Jun 19, 2025 at 7:46 PM Tao Chen <chen.dylane@xxxxxxxxx> wrote:
>
> 在 2025/6/20 01:17, Alexei Starovoitov 写道:
> > On Wed, Jun 18, 2025 at 8:44 PM Tao Chen <chen.dylane@xxxxxxxxx> wrote:
> >>
> >> Show kprobe_multi link info with fdinfo, the info as follows:
> >>
> >> link_type:      kprobe_multi
> >> link_id:        1
> >> prog_tag:       a15b7646cb7f3322
> >> prog_id:        21
> >> type:   kprobe_multi
> >
> > ..
> >
> >> +       seq_printf(seq,
> >> +                  "type:\t%s\n"
> >> +                  "kprobe_cnt:\t%u\n"
> >> +                  "missed:\t%lu\n",
> >> +                  kmulti_link->flags == BPF_F_KPROBE_MULTI_RETURN ? "kretprobe_multi" :
> >> +                                        "kprobe_multi",
> >
> > why print the same info twice ?
> > seq_printf(m, "link_type:\t%s\n", bpf_link_type_strs[type]);
> > in bpf_link_show_fdinfo() already did it in a cleaner way.
> >
>
> link_type only shows 'kprobe_multi', maybe we can show the format like:

Ohh. Especially so. It would be wrong and confusing to display:
link_type:      kprobe_multi
type: kretprobe_multi

Let's fix 'link_type' to display it properly.