From: Nick Desaulniers <ndesaulniers@google.com>
To: Sami Tolvanen <samitolvanen@google.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Will Deacon <will@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Kees Cook <keescook@chromium.org>,
Clang-Built-Linux ML <clang-built-linux@googlegroups.com>,
Kernel Hardening <kernel-hardening@lists.openwall.com>,
linux-arch <linux-arch@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-kbuild <linux-kbuild@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-pci@vger.kernel.org, X86 ML <x86@kernel.org>
Subject: Re: [PATCH v3 00/30] Add support for Clang LTO
Date: Fri, 18 Sep 2020 13:53:17 -0700 [thread overview]
Message-ID: <CAKwvOd=N5XS+c7X+fM+0aHWoo8j-xZ96Qk1a4n6gvYJZAq1mCQ@mail.gmail.com> (raw)
In-Reply-To: <CABCJKueyWvNB2MQw_PCLtZb8F1+sA1QOLJi_5qMKwdFCcwSMGg@mail.gmail.com>
On Fri, Sep 18, 2020 at 1:50 PM Sami Tolvanen <samitolvanen@google.com> wrote:
>
> On Fri, Sep 18, 2020 at 1:22 PM Sedat Dilek <sedat.dilek@gmail.com> wrote:
> >
> > On Fri, Sep 18, 2020 at 10:14 PM 'Sami Tolvanen' via Clang Built Linux
> > <clang-built-linux@googlegroups.com> wrote:
> > >
> > > 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 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 patches 1-5 are not directly related to LTO, but are
> > > needed to compile LTO kernels with ToT Clang, so I'm including them
> > > in the series for your convenience:
> > >
> > > - Patches 1-3 fix build issues with LLVM and they are already in
> > > linux-next.
> > >
> > > - Patch 4 fixes x86 builds with LLVM IAS, but it hasn't yet been
> > > picked up by maintainers.
> > >
> > > - Patch 5 is from Masahiro's kbuild tree and makes the LTO linker
> > > script changes much cleaner.
> > >
> >
> > Hi Sami,
> >
> > might be good to point to your GitHub tree and corresponding
> > release-tag for easy fetching.
>
> Ah, true. You can also pull this series from
>
> https://github.com/samitolvanen/linux.git lto-v3
Also, I've been using b4 happily for a short while now.
https://people.kernel.org/monsieuricon/introducing-b4-and-patch-attestation
My workflow would be: check lore.kernel.org/lkml/
for the series in question. In this case:
https://lore.kernel.org/lkml/CABCJKueyWvNB2MQw_PCLtZb8F1+sA1QOLJi_5qMKwdFCcwSMGg@mail.gmail.com/T/#t
is the cover letter. Then in my tree:
$ b4 am https://lore.kernel.org/lkml/CABCJKueyWvNB2MQw_PCLtZb8F1+sA1QOLJi_5qMKwdFCcwSMGg@mail.gmail.com/T/#t
-o - | git am
--
Thanks,
~Nick Desaulniers
prev parent reply other threads:[~2020-09-18 20:53 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 20:14 [PATCH v3 00/30] Add support for Clang LTO Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 01/30] lib/string.c: implement stpcpy Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 02/30] RAS/CEC: Fix cec_init() prototype Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 03/30] x86/boot/compressed: Disable relocation relaxation Sami Tolvanen
2020-09-21 15:53 ` Nick Desaulniers
2020-09-18 20:14 ` [PATCH v3 04/30] x86/asm: Replace __force_order with memory clobber Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 05/30] kbuild: preprocess module linker script Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 06/30] objtool: Add a pass for generating __mcount_loc Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 07/30] objtool: Don't autodetect vmlinux.o Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 08/30] kbuild: add support for objtool mcount Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 09/30] x86, build: use " Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 10/30] treewide: remove DISABLE_LTO Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 11/30] kbuild: add support for Clang LTO Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 12/30] kbuild: lto: fix module versioning Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 13/30] kbuild: lto: postpone objtool Sami Tolvanen
2020-09-18 21:27 ` Kees Cook
2020-09-21 18:58 ` Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 14/30] kbuild: lto: limit inlining Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 15/30] kbuild: lto: merge module sections Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 16/30] kbuild: lto: remove duplicate dependencies from .mod files Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 17/30] init: lto: ensure initcall ordering Sami Tolvanen
2020-09-18 21:29 ` Kees Cook
2020-09-18 20:14 ` [PATCH v3 18/30] init: lto: fix PREL32 relocations Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 19/30] PCI: Fix PREL32 relocations for LTO Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 20/30] modpost: lto: strip .lto from module names Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 21/30] scripts/mod: disable LTO for empty.c Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 22/30] efi/libstub: disable LTO Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 23/30] drivers/misc/lkdtm: disable LTO for rodata.o Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 24/30] arm64: export CC_USING_PATCHABLE_FUNCTION_ENTRY Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 25/30] arm64: vdso: disable LTO Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 26/30] KVM: arm64: disable LTO for the nVHE directory Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 27/30] arm64: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 28/30] x86, vdso: disable LTO only for vDSO Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 29/30] x86, cpu: disable LTO for cpu.c Sami Tolvanen
2020-09-18 20:14 ` [PATCH v3 30/30] x86, build: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-09-18 20:22 ` [PATCH v3 00/30] Add support for Clang LTO Sedat Dilek
2020-09-18 20:50 ` Sami Tolvanen
2020-09-18 20:53 ` Nick Desaulniers [this message]
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