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

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Message-ID: <aBczuIoPIV3kkCnu@gmail.com>
Date: Sun, 4 May 2025 11:30:32 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	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


* Steven Rostedt <rostedt@...dmis.org> wrote:

> +++ b/include/linux/unwind_user_types.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_UNWIND_USER_TYPES_H
> +#define _LINUX_UNWIND_USER_TYPES_H
> +
> +#include <linux/types.h>
> +
> +enum unwind_user_type {
> +	UNWIND_USER_TYPE_NONE,
> +};
> +
> +struct unwind_stacktrace {
> +	unsigned int	nr;
> +	unsigned long	*entries;
> +};
> +
> +struct unwind_user_frame {
> +	s32 cfa_off;
> +	s32 ra_off;
> +	s32 fp_off;
> +	bool use_fp;
> +};
> +
> +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?

Thanks,

	Ingo