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Date:   Thu, 19 Nov 2020 22:04:24 -0600
From:   Josh Poimboeuf <>
To:     Sami Tolvanen <>
Cc:     Masahiro Yamada <>,
        Steven Rostedt <>,
        Will Deacon <>,
        Peter Zijlstra <>,
        Greg Kroah-Hartman <>,
        "Paul E. McKenney" <>,
        Kees Cook <>,
        Nick Desaulniers <>,,,,,,,
Subject: Re: [PATCH v7 00/17] Add support for Clang LTO

On Wed, Nov 18, 2020 at 02:07:14PM -0800, Sami Tolvanen wrote:
> This patch series adds support for building the kernel 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 has shipped millions of Pixel devices
> running three major kernel versions with LTO+CFI 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 v7 brings back arm64 support as Will has now staged the
> prerequisite memory ordering patches [1], and drops x86_64 while we work
> on fixing the remaining objtool warnings [2].


Here are some patches to fix the objtool issues (other than crypto which
I'll work on next). objtool-vmlinux


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