linux-kernel - Re: [PATCH V3 03/13] kprobes: Add symbols for kprobe insn pages

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Date:   Sat, 29 Feb 2020 18:49:13 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 03/13] kprobes: Add symbols for kprobe insn pages

On Sat, 29 Feb 2020 13:49:47 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> On Fri, 28 Feb 2020 18:20:04 +0100
> Jiri Olsa <jolsa@...hat.com> wrote:
> 
> > > BTW, it seems to pretend to be a module, but is there no concern of
> > > confusing users? Shouldn't it be [*kprobes] so that it is non-exist
> > > module name?  
> > 
> > note we already have bpf symbols as [bpf] module  
> 
> Yeah, and this series adds [kprobe(s)] and [ftrace] too.
> I simply concern that the those module names implicitly become
> special word (rule) and embedded in the code. If such module names
> are not exposed to users, it is OK (but I hope to have some comments).
> However, it is under /proc, which means users can notice it.

I share Masami's concerns. It would be good to have something
differentiate local functions that are not modules. That's one way I
look to see if something is a module or built in, is to see if kallsyms
has it as a [].

Perhaps prepend with: '&' ?

-- Steve