Linux-KBuild Archive on lore.kernel.org
 help / color / Atom feed
From: Kees Cook <keescook@chromium.org>
To: Will Deacon <will@kernel.org>
Cc: Sami Tolvanen <samitolvanen@google.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	clang-built-linux@googlegroups.com,
	kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH v5 25/29] arm64: allow LTO_CLANG and THINLTO to be selected
Date: Mon, 12 Oct 2020 14:02:35 -0700
Message-ID: <202010121402.1EB5242@keescook> (raw)
In-Reply-To: <20201012205108.GA1620@willie-the-truck>

On Mon, Oct 12, 2020 at 09:51:09PM +0100, Will Deacon wrote:
> On Mon, Oct 12, 2020 at 01:44:56PM -0700, Kees Cook wrote:
> > On Mon, Oct 12, 2020 at 09:31:16AM +0100, Will Deacon wrote:
> > > On Fri, Oct 09, 2020 at 09:13:34AM -0700, Sami Tolvanen wrote:
> > > > Allow CONFIG_LTO_CLANG and CONFIG_THINLTO to be enabled.
> > > > 
> > > > Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
> > > > Reviewed-by: Kees Cook <keescook@chromium.org>
> > > > ---
> > > >  arch/arm64/Kconfig | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > > 
> > > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > > > index ad522b021f35..7016d193864f 100644
> > > > --- a/arch/arm64/Kconfig
> > > > +++ b/arch/arm64/Kconfig
> > > > @@ -72,6 +72,8 @@ config ARM64
> > > >  	select ARCH_USE_SYM_ANNOTATIONS
> > > >  	select ARCH_SUPPORTS_MEMORY_FAILURE
> > > >  	select ARCH_SUPPORTS_SHADOW_CALL_STACK if CC_HAVE_SHADOW_CALL_STACK
> > > > +	select ARCH_SUPPORTS_LTO_CLANG
> > > > +	select ARCH_SUPPORTS_THINLTO
> > > 
> > > Please don't enable this for arm64 until we have the dependency stuff sorted
> > > out. I posted patches [1] for this before, but I think they should be part
> > > of this series as they don't make sense on their own.
> > 
> > Oh, hm. We've been trying to trim down this series, since it's already
> > quite large. Why can't [1] land first? It would make this easier to deal
> > with, IMO.
> 
> I'm happy to handle [1] along with the LTO Kconfig change when the time
> comes, if that helps. I just don't want to merge dead code!

Okay, understood. Thanks!

> 
> Will
> 
> > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=rwonce/read-barrier-depends

-- 
Kees Cook

  reply index

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-09 16:13 [PATCH v5 00/29] Add support for Clang LTO Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 01/29] kbuild: preprocess module linker script Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 02/29] objtool: Add a pass for generating __mcount_loc Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 03/29] objtool: Don't autodetect vmlinux.o Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 04/29] tracing: move function tracer options to Kconfig Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 05/29] tracing: add support for objtool mcount Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 06/29] x86, build: use " Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 07/29] treewide: remove DISABLE_LTO Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 08/29] kbuild: add support for Clang LTO Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 09/29] kbuild: lto: fix module versioning Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 10/29] objtool: Split noinstr validation from --vmlinux Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 11/29] kbuild: lto: postpone objtool Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 12/29] kbuild: lto: limit inlining Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 13/29] kbuild: lto: merge module sections Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 14/29] kbuild: lto: remove duplicate dependencies from .mod files Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 15/29] init: lto: ensure initcall ordering Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 16/29] init: lto: fix PREL32 relocations Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 17/29] PCI: Fix PREL32 relocations for LTO Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 18/29] modpost: lto: strip .lto from module names Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 19/29] scripts/mod: disable LTO for empty.c Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 20/29] efi/libstub: disable LTO Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 21/29] drivers/misc/lkdtm: disable LTO for rodata.o Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 22/29] arm64: vdso: disable LTO Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 23/29] KVM: arm64: disable LTO for the nVHE directory Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 24/29] arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 25/29] arm64: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-10-12  8:31   ` Will Deacon
2020-10-12 20:44     ` Kees Cook
2020-10-12 20:51       ` Will Deacon
2020-10-12 21:02         ` Kees Cook [this message]
2020-10-09 16:13 ` [PATCH v5 26/29] x86/asm: annotate indirect jumps Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 27/29] x86, vdso: disable LTO only for vDSO Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 28/29] x86, cpu: disable LTO for cpu.c Sami Tolvanen
2020-10-09 16:13 ` [PATCH v5 29/29] x86, build: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-10-09 16:30 ` [PATCH v5 00/29] Add support for Clang LTO Sedat Dilek
2020-10-09 20:50   ` Sami Tolvanen
     [not found] ` <20201009153512.1546446a@gandalf.local.home>
2020-10-09 21:05   ` Sami Tolvanen
2020-10-09 23:38     ` Steven Rostedt
2020-10-10  0:00       ` Sami Tolvanen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=202010121402.1EB5242@keescook \
    --to=keescook@chromium.org \
    --cc=clang-built-linux@googlegroups.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=kernel-hardening@lists.openwall.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kbuild@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=masahiroy@kernel.org \
    --cc=ndesaulniers@google.com \
    --cc=paulmck@kernel.org \
    --cc=peterz@infradead.org \
    --cc=rostedt@goodmis.org \
    --cc=samitolvanen@google.com \
    --cc=will@kernel.org \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-KBuild Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-kbuild/0 linux-kbuild/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-kbuild linux-kbuild/ https://lore.kernel.org/linux-kbuild \
		linux-kbuild@vger.kernel.org
	public-inbox-index linux-kbuild

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kbuild


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git