Messages in this thread | | | Date | Tue, 29 Jun 2021 14:14:00 +0100 | From | Mark Rutland <> | Subject | Re: [GIT PULL] Clang feature updates for v5.14-rc1 |
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Hi Kees,
On Mon, Jun 28, 2021 at 12:32:24PM -0700, Kees Cook wrote: > Hi Linus, > > Please pull these Clang feature updates for v5.14-rc1. > > Thanks! > > -Kees > > The following changes since commit d07f6ca923ea0927a1024dfccafc5b53b61cfecc: > > Linux 5.13-rc2 (2021-05-16 15:27:44 -0700) > > are available in the Git repository at: > > https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git tags/clang-features-v5.14-rc1 > > for you to fetch changes up to 6a0544606ec7f03e4a2534c87ea989de4bac41ae: > > pgo: rectify comment to proper kernel-doc syntax (2021-06-28 12:10:31 -0700) > > ---------------------------------------------------------------- > Clang feature updates for v5.14-rc1 > > The big addition for this merge window is the core support for Clang's > Profile Guided Optimization, which lets Clang build the kernel for > improved performance when running specific kernel workloads. This > currently covers only vmlinux, but module support is under active > development. (Sami Tolvanen, Bill Wendling, Kees Cook, Jarmo Tiitto, > Lukas Bulwahn)
I thought the PGO stuff was on hold given Peter had open concerns, e.g.
https://lore.kernel.org/r/20210614154639.GB68749@worktop.programming.kicks-ass.net
... and there didn't seem to be a strong conclusion to the contrary.
> Added CC_HAS_NO_PROFILE_FN_ATTR in preparation for PGO support in > the face of the noinstr attribute, paving the way for PGO and fixing > GCOV. (Nick Desaulniers) > > x86_64 LTO coverage is expaned to 32-bit x86. (Nathan Chancellor) > > Small fixes to CFI. (Mark Rutland, Nathan Chancellor)
FWIW, all the rest of this looks good to me.
Thanks, Mark.
> > ---------------------------------------------------------------- > Bill Wendling (1): > pgo: rename the raw profile file to vmlinux.profraw > > Jarmo Tiitto (2): > pgo: Limit allocate_node() to vmlinux sections > pgo: Fix sleep in atomic section in prf_open() > > Kees Cook (2): > MAINTAINERS: Expand and relocate PGO entry > pgo: Clean up prf_open() error paths > > Lukas Bulwahn (1): > pgo: rectify comment to proper kernel-doc syntax > > Mark Rutland (1): > CFI: Move function_nocfi() into compiler.h > > Nathan Chancellor (2): > MAINTAINERS: Add Clang CFI section > x86, lto: Enable Clang LTO for 32-bit as well > > Nick Desaulniers (3): > compiler_attributes.h: define __no_profile, add to noinstr > compiler_attributes.h: cleanups for GCC 4.9+ > Kconfig: Introduce ARCH_WANTS_NO_INSTR and CC_HAS_NO_PROFILE_FN_ATTR > > Sami Tolvanen (1): > pgo: Add Clang's Profile Guided Optimization infrastructure > > Documentation/dev-tools/index.rst | 1 + > Documentation/dev-tools/pgo.rst | 127 +++++++++++ > MAINTAINERS | 25 ++ > Makefile | 3 + > arch/Kconfig | 8 + > arch/arm64/Kconfig | 1 + > arch/arm64/include/asm/compiler.h | 16 ++ > arch/arm64/include/asm/memory.h | 16 -- > arch/s390/Kconfig | 1 + > arch/x86/Kconfig | 6 +- > arch/x86/boot/Makefile | 1 + > arch/x86/boot/compressed/Makefile | 1 + > arch/x86/crypto/Makefile | 3 + > arch/x86/entry/vdso/Makefile | 1 + > arch/x86/kernel/Makefile | 3 + > arch/x86/kernel/vmlinux.lds.S | 2 + > arch/x86/platform/efi/Makefile | 1 + > arch/x86/purgatory/Makefile | 1 + > arch/x86/realmode/rm/Makefile | 1 + > arch/x86/um/vdso/Makefile | 1 + > drivers/firmware/efi/libstub/Makefile | 1 + > include/asm-generic/vmlinux.lds.h | 32 +++ > include/linux/compiler.h | 10 + > include/linux/compiler_attributes.h | 19 +- > include/linux/compiler_types.h | 2 +- > include/linux/mm.h | 10 - > init/Kconfig | 3 + > kernel/Makefile | 1 + > kernel/gcov/Kconfig | 1 + > kernel/pgo/Kconfig | 37 +++ > kernel/pgo/Makefile | 5 + > kernel/pgo/fs.c | 413 ++++++++++++++++++++++++++++++++++ > kernel/pgo/instrument.c | 188 ++++++++++++++++ > kernel/pgo/pgo.h | 211 +++++++++++++++++ > scripts/Makefile.lib | 10 + > 35 files changed, 1130 insertions(+), 32 deletions(-) > create mode 100644 Documentation/dev-tools/pgo.rst > create mode 100644 kernel/pgo/Kconfig > create mode 100644 kernel/pgo/Makefile > create mode 100644 kernel/pgo/fs.c > create mode 100644 kernel/pgo/instrument.c > create mode 100644 kernel/pgo/pgo.h > > -- > Kees Cook
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