From: Arvind Sankar <nivedita@alum.mit.edu>
Date: Mon, 18 May 2020 15:06:57 -0400
Subject: efi/libstub: Optimize for size instead of speed
Patch-mainline: v5.8-rc1
Git-commit: bbf8e8b0fe0401e1952c77088692fd273a9635a1
References: jsc#SLE-16407
Reclaim the bloat from the addition of printf by optimizing the stub for
size. With gcc 9, the text size of the stub is:
ARCH before +printf -Os
arm 35197 37889 34638
arm64 34883 38159 34479
i386 18571 21657 17025
x86_64 25677 29328 22144
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200518190716.751506-6-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
drivers/firmware/efi/libstub/Makefile | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -7,7 +7,7 @@
#
cflags-$(CONFIG_X86_32) := -march=i386
cflags-$(CONFIG_X86_64) := -mcmodel=small
-cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ -O2 \
+cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ \
-fPIC -fno-strict-aliasing -mno-red-zone \
-mno-mmx -mno-sse -fshort-wchar \
-Wno-pointer-sign \
@@ -25,7 +25,7 @@ cflags-$(CONFIG_ARM) := $(subst $(CC_FL
cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt
-KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
+KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \
-include $(srctree)/drivers/firmware/efi/libstub/hidden.h \
-D__NO_FORTIFY \
$(call cc-option,-ffreestanding) \