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

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Message-ID: <Z5vMfxFSIEtPMrMi@google.com>
Date: Thu, 30 Jan 2025 19:01:19 +0000
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Song Liu <song@...nel.org>
Cc: Weinan Liu <wnliu@...gle.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Indu Bhagat <indu.bhagat@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Rutland <mark.rutland@....com>, 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 Thu, Jan 30, 2025 at 10:34:09AM -0800, Song Liu wrote:
> On Thu, Jan 30, 2025 at 9:59 AM Song Liu <song@...nel.org> wrote:
> >
> > I missed this set before sending my RFC set. If this set works well, we
> > won't need the other set. I will give this one a try.
> 
> I just realized that llvm doesn't support sframe yet. So we (Meta) still
> need some sframe-less approach before llvm supports sframe.
> 
> IIRC, Google also uses llvm to compile the kernel. Weinan, would
> you mind share your thoughts on how we can adopt this before
> llvm supports sframe? (compile arm64 kernel with gcc?)

Hi Song,

the plan is to start the work on adding sframe support to llvm
in parallel to landing these changes upstream. From the initial
assessment it shouldn't be too hard.

Thanks