[PATCH bpf-next v3 3/6] bpf: fix the usage of BPF_TRAMP_F_SKIP_FRAME

[Menglong Dong]

On Fri, Dec 19, 2025 at 10:50 PM Andreas Schwab <schwab at linux-m68k.org> wrote:
>
> On Dez 19 2025, Menglong Dong wrote:
>
> > @@ -1171,6 +1167,8 @@ static int __arch_prepare_bpf_trampoline(struct
> > bpf_tramp_image *im,
> >         }
> >
> >         if (flags & BPF_TRAMP_F_CALL_ORIG) {
> > +               /* skip to actual body of traced function */
> > +               orig_call += RV_FENTRY_NINSNS * 4;
>
> Before this line, orig_call still contains the same value as func_addr,
> with the latter being dead, so there is not much point in using a copy.

Yeah, we can use "func_addr + RV_FENTRY_NINSNS * 4" here directly.

>
> --
> Andreas Schwab, schwab at linux-m68k.org
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