netdev - Re: [PATCH v13 bpf-next 1/1] rethook: x86: Add rethook x86 implementation

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Date:   Thu, 24 Mar 2022 19:03:43 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        X86 ML <x86@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH v13 bpf-next 1/1] rethook: x86: Add rethook x86 implementation

On Wed, Mar 23, 2022 at 4:41 AM Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
> On Wed, 23 Mar 2022 09:05:26 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
>
> > On Wed, Mar 23, 2022 at 11:34:59AM +0900, Masami Hiramatsu wrote:
> > > Add rethook for x86 implementation. Most of the code has been copied from
> > > kretprobes on x86.
> >
> > Right; as said, I'm really unhappy with growing a carbon copy of this
> > stuff instead of sharing. Can we *please* keep it a single instance?
>
> OK, then let me update the kprobe side too.
>
> > Them being basically indentical, it should be trivial to have
> > CONFIG_KPROBE_ON_RETHOOK (or somesuch) and just share this.
>
> Yes, ideally it should use CONFIG_HAVE_RETHOOK since the rethook arch port
> must be a copy of the kretprobe implementation. But for safety, I think
> having CONFIG_KPROBE_ON_RETHOOK is a good idea until replacing all kretprobe
> implementations.

Masami,

you're respinning this patch to combine
arch_rethook_trampoline and __kretprobe_trampoline
right?