On Sun, Jul 12, 2020 at 10:59:17AM +0200, Sedat Dilek wrote: > On Sat, Jul 11, 2020 at 6:32 PM Paul Menzel <pmenzel@xxxxxxxxxxxxx> 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/ > Sami tagged this series on his GitHub: https://github.com/samitolvanen/linux/releases/tag/lto-v1 git pull https://github.com/samitolvanen/linux lto-v1 Otherwise, he is updating the clang-cfi branch that includes both the LTO and CFI patchsets. You can pull that and just turn on CONFIG_LTO_CLANG. Lastly, for the future, I would recommend grabbing b4 to easily apply patches (specifically full series) from lore.kernel.org. https://git.kernel.org/pub/scm/utils/b4/b4.git/ https://git.kernel.org/pub/scm/utils/b4/b4.git/tree/README.rst You could grab this series and apply it easily by either downloading the mbox file and following the instructions it gives for applying the mbox file: $ b4 am 20200624203200.78870-1-samitolvanen@xxxxxxxxxx or I prefer piping so that I don't have to clean up later: $ b4 am -o - 20200624203200.78870-1-samitolvanen@xxxxxxxxxx | git am Cheers, Nathan
