From: Andi Kleen <andi@firstfloor.org>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, samitolvanen@google.com, alxmtvv@gmail.com,
linux-kbuild@vger.kernel.org, yamada.masahiro@socionext.com,
akpm@linux-foundation.org, Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 19/21] lto, x86: Disable LTO for realmode / vDSO / head64
Date: Mon, 27 Nov 2017 13:34:21 -0800 [thread overview]
Message-ID: <20171127213423.27218-20-andi@firstfloor.org> (raw)
In-Reply-To: <20171127213423.27218-1-andi@firstfloor.org>
From: Andi Kleen <ak@linux.intel.com>
These files all don't like being compiled with LTO. Disable
it for them.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
arch/x86/entry/vdso/Makefile | 3 +--
arch/x86/kernel/Makefile | 2 ++
arch/x86/realmode/Makefile | 1 +
3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
index 1943aebadede..76caa1159ce1 100644
--- a/arch/x86/entry/vdso/Makefile
+++ b/arch/x86/entry/vdso/Makefile
@@ -3,7 +3,6 @@
# Building vDSO images for x86.
#
-KBUILD_CFLAGS += $(DISABLE_LTO)
KASAN_SANITIZE := n
UBSAN_SANITIZE := n
OBJECT_FILES_NON_STANDARD := y
@@ -74,7 +73,7 @@ $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
-fno-omit-frame-pointer -foptimize-sibling-calls \
- -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
+ -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO $(DISABLE_LTO)
$(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 81bb565f4497..18106858d4c3 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -22,6 +22,8 @@ CFLAGS_REMOVE_early_printk.o = -pg
CFLAGS_REMOVE_head64.o = -pg
endif
+CFLAGS_head64.o += $(DISABLE_LTO)
+
KASAN_SANITIZE_head$(BITS).o := n
KASAN_SANITIZE_dumpstack.o := n
KASAN_SANITIZE_dumpstack_$(BITS).o := n
diff --git a/arch/x86/realmode/Makefile b/arch/x86/realmode/Makefile
index 682c895753d9..719f423da3a0 100644
--- a/arch/x86/realmode/Makefile
+++ b/arch/x86/realmode/Makefile
@@ -6,6 +6,7 @@
# for more details.
#
#
+KBUILD_CFLAGS += $(DISABLE_LTO)
KASAN_SANITIZE := n
OBJECT_FILES_NON_STANDARD := y
--
2.13.6
next prev parent reply other threads:[~2017-11-27 21:34 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 21:34 Link time optimization for LTO/x86 Andi Kleen
2017-11-27 21:34 ` [PATCH 01/21] x86/xen: Mark pv stub assembler symbol visible Andi Kleen
2017-11-27 21:34 ` [PATCH 02/21] afs: Fix const confusion in AFS Andi Kleen
2017-11-28 16:04 ` David Howells
2017-11-28 16:50 ` Andi Kleen
2017-11-27 21:34 ` [PATCH 03/21] x86/timer: Don't inline __const_udelay Andi Kleen
2017-11-27 21:34 ` [PATCH 04/21] locking/spinlocks: Mark spinlocks noinline when inline spinlocks are disabled Andi Kleen
2017-11-27 21:34 ` [PATCH 05/21] x86/kvm: Make steal_time visible Andi Kleen
2017-11-27 21:34 ` [PATCH 06/21] x86/syscalls: Make x86 syscalls use real prototypes Andi Kleen
2017-11-27 21:34 ` [PATCH 07/21] x86: Make exception handler functions visible Andi Kleen
2017-11-27 21:34 ` [PATCH 08/21] x86/idt: Make const __initconst Andi Kleen
2017-11-27 21:34 ` [PATCH 09/21] lto: Use C version for SYSCALL_ALIAS Andi Kleen
2017-11-27 21:34 ` [PATCH 10/21] Fix read buffer overflow in delta-ipc Andi Kleen
2017-11-27 21:34 ` [PATCH 11/21] trace: Use -mcount-record for dynamic ftrace Andi Kleen
2017-12-01 0:22 ` Steven Rostedt
2018-05-01 18:42 ` Steven Rostedt
2017-11-27 21:34 ` [PATCH 12/21] ftrace: Mark function tracer test functions noinline/noclone Andi Kleen
2017-11-27 21:34 ` [PATCH 13/21] ftrace: Disable LTO for ftrace self tests Andi Kleen
2017-11-27 21:34 ` [PATCH 14/21] lto, fs: Avoid static variable in linux/fs.h Andi Kleen
2017-11-27 21:34 ` [PATCH 15/21] lto, x86, mm: Disable vmalloc BUILD_BUG_ON for LTO Andi Kleen
2017-11-27 21:34 ` [PATCH 16/21] lto: Add __noreorder and mark initcalls __noreorder Andi Kleen
2017-11-27 21:34 ` [PATCH 17/21] lto, workaround: Disable LTO for BPF Andi Kleen
2017-11-27 21:34 ` [PATCH 18/21] lto, crypto: Disable LTO for camelia glue Andi Kleen
2017-11-27 21:34 ` Andi Kleen [this message]
2017-11-27 21:34 ` [PATCH 20/21] Kbuild, lto: Add Link Time Optimization support Andi Kleen
2018-01-27 0:15 ` Arnd Bergmann
2018-01-27 0:55 ` Andi Kleen
2018-01-27 14:26 ` Arnd Bergmann
2018-01-28 18:33 ` Andi Kleen
2017-11-27 21:34 ` [PATCH 21/21] x86: Enable Link Time Optimization Andi Kleen
2017-11-29 23:09 ` Link time optimization for LTO/x86 Sami Tolvanen
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