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kernel: use KCFLAGS for passing EXTRA_OPTIMIZATION flags 

This uses kernel's generic variable and doesn't require patching it with
a custom Makefile change. It's expected *not* to change any behaviour.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 1d42af720c)
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
(cherry picked from commit 24e27bec9a)
This commit is contained in:
Rafał Miłecki 2022-06-15 10:41:37 +02:00
parent bd84d517eb
commit 44fa330a82
3 changed files with 4 additions and 11 deletions
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2
include/kernel.mk
View File

@ -101,7 +101,7 @@ endif
KERNEL_MAKE = $(MAKE) $(KERNEL_MAKEOPTS)
KERNEL_MAKE_FLAGS = \
KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR)))" \
KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION)))" \
HOSTCFLAGS="$(HOST_CFLAGS) -Wall -Wmissing-prototypes -Wstrict-prototypes" \
CROSS_COMPILE="$(KERNEL_CROSS)" \
ARCH="$(LINUX_KARCH)" \

1
rules.mk
View File

@ -62,7 +62,6 @@ ARCH_PACKAGES:=$(call qstrip,$(CONFIG_TARGET_ARCH_PACKAGES))
BOARD:=$(call qstrip,$(CONFIG_TARGET_BOARD))
SUBTARGET:=$(call qstrip,$(CONFIG_TARGET_SUBTARGET))
TARGET_OPTIMIZATION:=$(call qstrip,$(CONFIG_TARGET_OPTIMIZATION))
export EXTRA_OPTIMIZATION:=$(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION)))
TARGET_SUFFIX=$(call qstrip,$(CONFIG_TARGET_SUFFIX))
BUILD_SUFFIX:=$(call qstrip,$(CONFIG_BUILD_SUFFIX))
SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})

12
target/linux/generic/pending-5.4/201-extra_optimization.patch
View File

@ -14,18 +14,12 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/Makefile
+++ b/Makefile
@@ -719,11 +719,11 @@ KBUILD_CFLAGS += $(call cc-disable-warni
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
-KBUILD_CFLAGS += -O2
+KBUILD_CFLAGS += -O2 $(EXTRA_OPTIMIZATION)
@@ -723,7 +723,7 @@ KBUILD_CFLAGS += -O2
else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
-KBUILD_CFLAGS += -O3
+KBUILD_CFLAGS += -O3 $(EXTRA_OPTIMIZATION)
KBUILD_CFLAGS += -O3
else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS += -Os
+KBUILD_CFLAGS += -Os -fno-reorder-blocks -fno-tree-ch $(EXTRA_OPTIMIZATION)
+KBUILD_CFLAGS += -Os -fno-reorder-blocks -fno-tree-ch
endif
# Tell gcc to never replace conditional load with a non-conditional one