linux-kernel - Re: [PATCH v7 01/17] unwind_user: Add user space unwinding API

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Message-ID: <bgnoc3j5etfi53otrrn4u23k7ly5ltyun7uhhmw5vhebsqlzgs@bl7ymu7bd74z>
Date: Sun, 4 May 2025 10:53:56 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Peter Zijlstra <peterz@...radead.org>, x86@...nel.org, 
	Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v7 01/17] unwind_user: Add user space unwinding API

On Sun, May 04, 2025 at 12:43:30PM -0400, Steven Rostedt wrote:
> On Sun, 4 May 2025 11:30:32 +0200
> Ingo Molnar <mingo@...nel.org> wrote:
> 
> > > +struct unwind_user_state {
> > > +	unsigned long ip;
> > > +	unsigned long sp;
> > > +	unsigned long fp;
> > > +	enum unwind_user_type type;
> > > +	bool done;
> > > +};  
> > 
> > Will any of these types be visible to tooling via ABIs?
> 
> Not that I'm aware of. Josh can confirm. Josh?
> 
> With the exception of BTF (which exposes pretty much all structures), I
> believe this is completely internal for the generic code of the unwinder.

Correct, these types are strictly internal to the kernel.

-- 
Josh