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From: Sami Tolvanen <samitolvanen@google.com>
To: Kees Cook <keescook@chromium.org>
Cc: linux-arch <linux-arch@vger.kernel.org>, X86 ML <x86@kernel.org>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Kernel Hardening <kernel-hardening@lists.openwall.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Masahiro Yamada <masahiroy@kernel.org>,
	linux-kbuild <linux-kbuild@vger.kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	linux-pci@vger.kernel.org, Will Deacon <will@kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 13/30] kbuild: lto: postpone objtool
Date: Mon, 21 Sep 2020 11:58:19 -0700	[thread overview]
Message-ID: <CABCJKuf5pKqEDaAKix5CaUmv92M5HOAB-psdNg=awF7BDZ+yvA@mail.gmail.com> (raw)
In-Reply-To: <202009181427.86DE61B@keescook>

Nick and 0-day bot both let me know that there's a typo in this patch,
which I'll fix in v4:

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index f7daa59ff14f..00d7baaf7949 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -223,7 +223,7 @@ dtc_cpp_flags  = -Wp,-MMD,$(depfile).pre.tmp
-nostdinc                    \
 objtool_args =                                                         \
        $(if $(CONFIG_UNWINDER_ORC),orc generate,check)                 \
        $(if $(part-of-module), --module,)                              \
-       $(if $(CONFIG_FRAME_POINTER), --no-fp,)                         \
+       $(if $(CONFIG_FRAME_POINTER),, --no-fp)                         \
        $(if $(CONFIG_GCOV_KERNEL), --no-unreachable,)                  \
        $(if $(CONFIG_RETPOLINE), --retpoline,)                         \
        $(if $(CONFIG_X86_SMAP), --uaccess,)                            \

Sami

On Fri, Sep 18, 2020 at 2:27 PM Kees Cook <keescook@chromium.org> wrote:
>
> On Fri, Sep 18, 2020 at 01:14:19PM -0700, Sami Tolvanen wrote:
> > With LTO, LLVM bitcode won't be compiled into native code until
> > modpost_link, or modfinal for modules. This change postpones calls
> > to objtool until after these steps, and moves objtool_args to
> > Makefile.lib, so the arguments can be reused in Makefile.modfinal.
> >
> > Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
>
> Thanks for reorganizing this!
>
> Reviewed-by: Kees Cook <keescook@chromium.org>
>
> --
> Kees Cook
>
> --
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  reply	other threads:[~2020-09-21 19:00 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 [this message]
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

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