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

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Message-ID: <CAPhsuW76YZRBFgQf9PJ3OkaarbyDyWg=yXin9CXgNSwZYRnTZg@mail.gmail.com>
Date: Thu, 30 Jan 2025 11:18:09 -0800
From: Song Liu <song@...nel.org>
To: Roman Gushchin <roman.gushchin@...ux.dev>
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

Hi Roman,

On Thu, Jan 30, 2025 at 11:01 AM Roman Gushchin
<roman.gushchin@...ux.dev> wrote:
>
> 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 for the information!

Song