linux-kernel - Re: [RFC bpf-next 4/4] selftests/bpf: Add attach bench test

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Date:   Wed, 13 Apr 2022 12:44:19 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Networking <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>
Subject: Re: [RFC bpf-next 4/4] selftests/bpf: Add attach bench test

On Tue, 12 Apr 2022 09:49:23 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > I'm really curious how did you manage to attach to everything in
> > available_filter_functions because when I'm trying to do that I fail.
> > available_filter_functions has a bunch of functions that should not be
> > attachable (e.g., notrace functions). Look just at __bpf_tramp_exit:
> > 
> >   void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);  

Did you only use the "notrace" on the prototype? I see the semicolon at
the end of your comment. It only affects the actual function itself,
not the prototype.

-- Steve