Re: [PATCH bpf-next v6 00/10] bpf: fsession support

[Alexei Starovoitov]

On Sun, Jan 4, 2026 at 4:28 AM Menglong Dong <menglong8.dong@xxxxxxxxx> wrote:
>
> In current solution, we can't reuse the existing bpf_session_cookie() and
> bpf_session_is_return(), as their prototype is different from
> bpf_fsession_is_return() and bpf_fsession_cookie(). In
> bpf_fsession_cookie(), we need the function argument "void *ctx" to get
> the cookie. However, the prototype of bpf_session_cookie() is "void".

I think it's ok to change proto to bpf_session_cookie(void *ctx)
for kprobe-session. It's not widely used yet, so proto change is ok
if it helps to simplify this tramp-session code.
I see that you adjust get_kfunc_ptr_arg_type(), so the verifier
will enforce PTR_TO_CTX for kprobe and trampoline.
Potentially can relax and enforce r1==ctx only for trampoline,
but I would do it for both for consistency.