linux-kernel - Re: [PATCH v3 1/2] arm64: Implement arch_stack_walk

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Message-ID: <etrj2xdtc6djnwtwlghymlu4c3gg5wnyg3qqfdiod4g6hjgzzi@yxj6no3stqjv>
Date: Fri, 21 Mar 2025 00:11:55 -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 v3 1/2] arm64: Implement arch_stack_walk_reliable

On Thu, Mar 20, 2025 at 10:15:58AM -0700, Song Liu wrote:
> With proper exception boundary detection, it is possible to implment
> arch_stack_walk_reliable without sframe.
> 
> Note that, arch_stack_walk_reliable does not guarantee getting reliable
> stack in all scenarios. Instead, it can reliably detect when the stack
> trace is not reliable, which is enough to provide reliable livepatching.
> 
> Signed-off-by: Song Liu <song@...nel.org>

Reviewed-by: Josh Poimboeuf <jpoimboe@...nel.org>

-- 
Josh