linux-kernel - Re: [PATCH 0/8] unwind, arm64: add sframe unwinder for kernel

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Message-ID: <20250218063702.e2qrpjk4ylhnk5s7@jpoimboe>
Date: Mon, 17 Feb 2025 22:37:02 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Song Liu <song@...nel.org>
Cc: Puranjay Mohan <puranjay@...nel.org>, Weinan Liu <wnliu@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Indu Bhagat <indu.bhagat@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Rutland <mark.rutland@....com>, roman.gushchin@...ux.dev,
	Will Deacon <will@...nel.org>, Ian Rogers <irogers@...gle.com>,
	linux-toolchains@...r.kernel.org, linux-kernel@...r.kernel.org,
	live-patching@...r.kernel.org, joe.lawrence@...hat.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/8] unwind, arm64: add sframe unwinder for kernel

On Mon, Feb 17, 2025 at 08:38:22PM -0800, Song Liu wrote:
> On Fri, Feb 14, 2025 at 3:23 PM Josh Poimboeuf <jpoimboe@...nel.org> wrote:
> > Poking around the arm64 module code, arch/arm64/kernel/module-plts.c
> > is looking at all the relocations in order to set up the PLT.  That also
> > needs to be done for klp relas, or are your patches already doing that?
> 
> I don't think either version (this set and my RFC) added logic for PLT.
> There is some rela logic on the kpatch-build side. But I am not sure
> whether it is sufficient.

The klp relas looked ok.  I didn't see any signs of kpatch-build doing
anything wrong.  AFAICT the problem is that module-plts.c creates PLT
entries for regular relas but not klp relas.

-- 
Josh