linux-kernel - Re: [PATCH 40/46] x86/livepatch, lto: Disable live patching with gcc LTO

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Date:   Thu, 17 Nov 2022 12:00:03 -0800
From:   Song Liu <song@...nel.org>
To:     "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        live-patching@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Martin Liska <mliska@...e.cz>, Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH 40/46] x86/livepatch, lto: Disable live patching with gcc LTO

On Mon, Nov 14, 2022 at 3:48 AM Jiri Slaby (SUSE) <jirislaby@...nel.org> wrote:
>
> From: Andi Kleen <andi@...stfloor.org>
>
> It is not supported by gcc 12 so far, so it causes compiler "sorry"
> messages.
>
> Other than the compiler support, there shouldn't be any barriers for
> live patching LTOed kernels, although it might be more difficult to
> create patches for larger functions.

A loosely related question: does livepatch work with CLANG LTO?
AFAICT, kpatch-build doesn't support it. But the kernel side should
work just fine?

Thanks,
Song

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