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Message-ID: <20210629131400.GA24514@C02TD0UTHF1T.local>
Date: Tue, 29 Jun 2021 14:14:00 +0100
From: Mark Rutland <mark.rutland@....com>
To: Kees Cook <keescook@...omium.org>,
Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
linux-kernel@...r.kernel.org, Bill Wendling <morbo@...gle.com>,
Bill Wendling <wcw@...gle.com>,
Catalin Marinas <catalin.marinas@....com>,
clang-built-linux@...glegroups.com,
Fangrui Song <maskray@...gle.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Jarmo Tiitto <jarmo.tiitto@...il.com>,
Lukas Bulwahn <lukas.bulwahn@...il.com>,
Masahiro Yamada <masahiroy@...nel.org>,
Miguel Ojeda <ojeda@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Peter Oberparleiter <oberpar@...ux.ibm.com>,
Sami Tolvanen <samitolvanen@...gle.com>,
Will Deacon <will@...nel.org>
Subject: Re: [GIT PULL] Clang feature updates for v5.14-rc1
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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