On Sun, Jul 12, 2020 at 8:40 PM Nathan Chancellor <natechancel...@gmail.com> wrote: > > On Sun, Jul 12, 2020 at 10:59:17AM +0200, Sedat Dilek wrote: > > On Sat, Jul 11, 2020 at 6:32 PM Paul Menzel <pmen...@molgen.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/ > > > > 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-samitolva...@google.com > > or I prefer piping so that I don't have to clean up later: > > $ b4 am -o - 20200624203200.78870-1-samitolva...@google.com | git am >
It is always a pleasure to read your replies and enrich my know-how beyond Linux-kernel hacking :-). Thanks for the tip with "b4" tool. Might add this to our ClangBuiltLinux wiki "Command line tips and tricks"? - Sedat - [1] https://github.com/ClangBuiltLinux/linux/wiki/Command-line-tips-and-tricks
