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Date: Wed, 18 Jun 2025 15:47:58 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
	bpf@vger.kernel.org, x86@kernel.org,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
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	Andrii Nakryiko <andrii@kernel.org>,
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	"Jose E. Marchesi" <jemarch@gnu.org>,
	Beau Belgrave <beaub@linux.microsoft.com>,
	Jens Remus <jremus@linux.ibm.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v10 03/14] unwind_user: Add compat mode frame pointer
 support
Message-ID: <20250618134758.GK1613376@noisy.programming.kicks-ass.net>
References: <20250611005421.144238328@goodmis.org>
 <20250611010428.261095906@goodmis.org>
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In-Reply-To: <20250611010428.261095906@goodmis.org>

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.