linux-kernel - Re: [PATCH 00/22] add support for Clang LTO

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Message-ID: <CA+icZUXPB_C1bjA13zi3OLFCpiZh+GsgHT0y6kumzVRavs4LkQ@mail.gmail.com>
Date:   Sun, 12 Jul 2020 10:59:17 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        kernel-hardening@...ts.openwall.com, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH 00/22] add support for Clang LTO

On Sat, Jul 11, 2020 at 6:32 PM Paul Menzel <pmenzel@...gen.mpg.de> wrote:
>
> Dear Sami,
>
>
> Am 24.06.20 um 22:31 schrieb Sami Tolvanen:
> > This patch series adds support for building x86_64 and arm64 kernels
> > with Clang's Link Time Optimization (LTO).
> >
> > In addition to performance, the primary motivation for LTO is to allow
> > Clang's Control-Flow Integrity (CFI) to be used in the kernel. Google's
> > Pixel devices have shipped with LTO+CFI kernels since 2018.
> >
> > Most of the patches are build system changes for handling LLVM bitcode,
> > which Clang produces with LTO instead of ELF object files, postponing
> > ELF processing until a later stage, and ensuring initcall ordering.
> >
> > Note that first objtool patch in the series is already in linux-next,
> > but as it's needed with LTO, I'm including it also here to make testing
> > easier.
>
> […]
>
> Thank you very much for sending these changes.
>
> Do you have a branch, where your current work can be pulled from? Your
> branch on GitHub [1] seems 15 months old.
>

Agreed it's easier to git-pull.
I have seen [1] - not sure if this is the latest version.
Alternatively, you can check patchwork LKML by searching for $submitter.
( You can open patch 01/22 and download the whole patch-series by
following the link "series", see [3]. )

- Sedat -

[1] https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git/log/?h=lto
[2] https://lore.kernel.org/patchwork/project/lkml/list/?series=&submitter=19676
[3] https://lore.kernel.org/patchwork/series/450026/mbox/