linux-kernel - Re: [PATCH v3 0/2] arm64: livepatch: Enable livepatch without sframe

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Message-ID: <aCsqsyjvD72YXtOJ@J2N7QTR9R3>
Date: Mon, 19 May 2025 13:57:23 +0100
From: Mark Rutland <mark.rutland@....com>
To: Song Liu <song@...nel.org>
Cc: Petr Mladek <pmladek@...e.com>, 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, jpoimboe@...nel.org, peterz@...radead.org,
	roman.gushchin@...ux.dev, rostedt@...dmis.org, will@...nel.org,
	kernel-team@...a.com
Subject: Re: [PATCH v3 0/2] arm64: livepatch: Enable livepatch without sframe

On Fri, May 16, 2025 at 09:53:36AM -0700, Song Liu wrote:
> On Thu, Apr 10, 2025 at 8:17 AM Petr Mladek <pmladek@...e.com> wrote:
> >
> [...]
> > >
> > > [1] https://lore.kernel.org/live-patching/20250127213310.2496133-1-wnliu@google.com/
> > > [2] https://lore.kernel.org/live-patching/20250129232936.1795412-1-song@kernel.org/
> > > [3] https://sourceware.org/bugzilla/show_bug.cgi?id=32589
> > > [4] https://lore.kernel.org/linux-arm-kernel/20241017092538.1859841-1-mark.rutland@arm.com/
> > >
> > > Changes v2 => v3:
> > > 1. Remove a redundant check for -ENOENT. (Josh Poimboeuf)
> > > 2. Add Tested-by and Acked-by on v1. (I forgot to add them in v2.)
> >
> > The approach and both patches look reasonable:
> >
> > Reviewed-by: Petr Mladek <pmladek@...e.com>
> >
> > Is anyone, Arm people, Mark, against pushing this into linux-next,
> > please?
> 
> Ping.
> 
> ARM folks, please share your thoughts on this work. To fully support
> livepatching of kernel modules, we also need [1]. We hope we can
> land this in the 6.16 kernel.

Hi; apologies for the delay -- my time had been consumed by
FPSIMD/SVE/SME fixes and related non-upstream stuff for the last few
weeks, and now I'm catching up.

For the stacktrace side, I'm happy with enabling this without sframe,
and I hase some minor nits which we can either fix up now or as a
follow-up. I'll cover those in another reply, and chase up the module /
code-patching bit shortly.

Mark.

> Thanks,
> Song
> 
> [1] https://lore.kernel.org/linux-arm-kernel/20250412010940.1686376-1-dylanbhatch@google.com/