linux-kernel - Re: Question about config UPROBES and UPROBE

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Message-ID: <20240930113231.6c87108d@gandalf.local.home>
Date: Mon, 30 Sep 2024 11:32:31 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Tiezhu Yang <yangtiezhu@...ngson.cn>,
 linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Question about config UPROBES and UPROBE_EVENTS

On Tue, 1 Oct 2024 00:28:13 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> On Mon, 30 Sep 2024 10:06:30 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > On Mon, 30 Sep 2024 09:33:42 +0800
> > Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> >   
> > > > the CONFIG_UPROBES is disabled by default and make CONFIG_UPROBE_EVENTS
> > > > depending on it, the uprobe_events menu is hidden. I don't like this.    
> > > 
> > > This is somehow like the current status of CONFIG_KPROBES and
> > > CONFIG_KPROBE_EVENTS.  
> > 
> > The question is, can uprobes be used without uprobe_events? With the
> > current BPF work that I haven't been following, it may be possible now.  
> 
> uprobe_register/unregister APIs are exposed to the kernel modules,
> since systemtap had been introduced this feature.
>

OK, but since they have always been visible, I would just make
CONFIG_UPROBES a normal option and CONFIG_UPROBE_EVENTS select it if it
gets selected, and not depend on it.

-- Steve