Messages in this thread | | | Date | Thu, 19 Nov 2020 22:04:24 -0600 | From | Josh Poimboeuf <> | Subject | Re: [PATCH v7 00/17] Add support for Clang LTO |
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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].
Sami,
Here are some patches to fix the objtool issues (other than crypto which I'll work on next).
https://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git objtool-vmlinux
-- Josh
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