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Date: Wed, 13 Apr 2022 09:45:52 -0700 From: Andrii Nakryiko <andrii.nakryiko@...il.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: Masami Hiramatsu <mhiramat@...nel.org>, 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 Wed, Apr 13, 2022 at 9:44 AM Steven Rostedt <rostedt@...dmis.org> wrote: > > 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. notrace is both on declaration and on definition, see kernel/bpf/trampoline.c: void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr) { percpu_ref_put(&tr->pcref); } > > -- Steve
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