linux-kernel - Re: [PATCH v10 03/14] unwind_user: Add compat mode frame pointer support

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Message-ID: <20250618134758.GK1613376@noisy.programming.kicks-ass.net>
Date: Wed, 18 Jun 2025 15:47:58 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	bpf@...r.kernel.org, x86@...nel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrii Nakryiko <andrii@...nel.org>,
	Indu Bhagat <indu.bhagat@...cle.com>,
	"Jose E. Marchesi" <jemarch@....org>,
	Beau Belgrave <beaub@...ux.microsoft.com>,
	Jens Remus <jremus@...ux.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v10 03/14] unwind_user: Add compat mode frame pointer
 support

On Tue, Jun 10, 2025 at 08:54:24PM -0400, Steven Rostedt wrote:

> +#ifndef arch_unwind_user_init
> +static inline void arch_unwind_user_init(struct unwind_user_state *state, struct pt_regs *reg) {}
> +#endif
> +
> +#ifndef arch_unwind_user_next
> +static inline void arch_unwind_user_next(struct unwind_user_state *state) {}
> +#endif

The purpose of these arch hooks is so far mysterious. No comments, no
changelog, no nothing.