linux-kernel - Re: [PATCH v2 1/2] arm64: Implement arch_stack_walk

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Message-ID: <yrqgoc66te54tuffkrc74clsosiid2giw3gpc3kd3ddl4662tb@kiqh3ncfxwnl>
Date: Wed, 19 Mar 2025 15:35:55 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Song Liu <song@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-toolchains@...r.kernel.org, live-patching@...r.kernel.org, indu.bhagat@...cle.com, 
	puranjay@...nel.org, wnliu@...gle.com, irogers@...gle.com, joe.lawrence@...hat.com, 
	mark.rutland@....com, peterz@...radead.org, roman.gushchin@...ux.dev, 
	rostedt@...dmis.org, will@...nel.org, kernel-team@...a.com
Subject: Re: [PATCH v2 1/2] arm64: Implement arch_stack_walk_reliable

On Wed, Mar 19, 2025 at 02:37:06PM -0700, Song Liu wrote:
> +noinline noinstr int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
> +			void *cookie, struct task_struct *task)
> +{
> +	struct kunwind_consume_entry_data data = {
> +		.consume_entry = consume_entry,
> +		.cookie = cookie,
> +	};
> +	int ret;
> +
> +	ret = kunwind_stack_walk(arch_kunwind_consume_entry, &data, task, NULL, true);
> +	if (ret == -ENOENT)
> +		ret = 0;

Is this check redundant with the -ENOENT check in do_kunwind() which
already converts ret to zero?

-- 
Josh