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Message-ID: <20250918113234.3f9e556a@gandalf.local.home> Date: Thu, 18 Sep 2025 11:32:34 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Fuyu Zhao <zhaofuyu@...o.com> Cc: Jiri Olsa <olsajiri@...il.com>, Song Liu <song@...nel.org>, ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev, yonghong.song@...ux.dev, haoluo@...gle.com, eddyz87@...il.com, kpsingh@...nel.org, sdf@...ichev.me, mhiramat@...nel.org, mathieu.desnoyers@...icios.com, shuah@...nel.org, willemb@...gle.com, kerneljasonxing@...il.com, paul.chaignon@...il.com, chen.dylane@...ux.dev, memxor@...il.com, martin.kelly@...wdstrike.com, ameryhung@...il.com, linux-kernel@...r.kernel.org, bpf@...r.kernel.org, linux-trace-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, yikai.lin@...o.com Subject: Re: [RFC PATCH bpf-next v1 0/3] bpf: Add BPF program type for overriding tracepoint probes On Thu, 18 Sep 2025 21:15:57 +0800 Fuyu Zhao <zhaofuyu@...o.com> wrote: > As for the reason not to unregister and register a new callback: > callbacks registered directly inside the kernel cannot be unregistered from > user space. From user space, we can only attach additional callbacks > with BPF programs, but can not remove or replace the ones already > registered in the kernel. Therefore, an override mechanism is needed. The fact that user space cannot unregister or override the current callbacks, to me is a feature and not a bug. -- Steve
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