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

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Message-ID: <20250504124330.6a62e7b5@batman.local.home>
Date: Sun, 4 May 2025 12:43:30 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Ingo Molnar <mingo@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>
Cc: 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, 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.

-- Steve