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platform_vendor_tequila/build/tasks/kernel.mk
Adrian DC 70d5cc42e0 kernel: prevent additional config from being always rebuilt 
* A simple "make kernel" or incremental system build
   always triggers a complete kernel recompilation,
   even though the kernel sources were unchanged

 * The reason is because .additional_config is always
   considered new and invalidates the .config file,
   forcing the kernel to rebuild itself every time

 * Instead, prevent the /dev/null and KERNEL_OBJ dependencies
   having irrelevant timestamp changes with an empty variable

 * Command "make kernel" takes 3 seconds versus 40s before

Change-Id: I3b583077b7ef5873eebde3e4b0e790f5d7587ed3
Signed-off-by: Adrian DC <radian.dc@gmail.com>
2020-08-30 17:43:42 +02:00

362 lines
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Makefile
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# Copyright (C) 2012 The CyanogenMod Project
# (C) 2017-2020 The LineageOS Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Android makefile to build kernel as a part of Android Build
#
# Configuration
# =============
#
# These config vars are usually set in BoardConfig.mk:
#
# TARGET_KERNEL_CONFIG = Kernel defconfig
# TARGET_KERNEL_VARIANT_CONFIG = Variant defconfig, optional
# TARGET_KERNEL_SELINUX_CONFIG = SELinux defconfig, optional
# TARGET_KERNEL_ADDITIONAL_CONFIG = Additional defconfig, optional
#
# TARGET_KERNEL_CLANG_COMPILE = Compile kernel with clang, defaults to false
#
# TARGET_KERNEL_CLANG_VERSION = Clang prebuilts version, optional, defaults to clang-stable
#
# TARGET_KERNEL_CLANG_PATH = Clang prebuilts path, optional
#
# BOARD_KERNEL_IMAGE_NAME = Built image name
# for ARM use: zImage
# for ARM64 use: Image.gz
# for uncompressed use: Image
# If using an appended DT, append '-dtb'
# to the end of the image name.
# For example, for ARM devices,
# use zImage-dtb instead of zImage.
#
# BOARD_DTBO_CFG = Path to a mkdtboimg.py config file
#
# BOARD_CUSTOM_DTBOIMG_MK = Path to a custom dtboimage makefile
#
# KERNEL_CC = The C Compiler used. This is automatically set based
# on whether the clang version is set, optional.
# KERNEL_LD = The Linker used. This is automatically set based
# on whether the clang/gcc version is set, optional.
#
# KERNEL_CLANG_TRIPLE = Target triple for clang (e.g. aarch64-linux-gnu-)
# defaults to arm-linux-gnu- for arm
# aarch64-linux-gnu- for arm64
# x86_64-linux-gnu- for x86
#
# NEED_KERNEL_MODULE_ROOT = Optional, if true, install kernel
# modules in root instead of vendor
# NEED_KERNEL_MODULE_SYSTEM = Optional, if true, install kernel
# modules in system instead of vendor
# NEED_KERNEL_MODULE_VENDOR_OVERLAY = Optional, if true, install kernel
# modules in vendor_overlay instead of vendor
ifneq ($(TARGET_NO_KERNEL),true)
## Externally influenced variables
KERNEL_SRC := $(TARGET_KERNEL_SOURCE)
# kernel configuration - mandatory
KERNEL_DEFCONFIG := $(TARGET_KERNEL_CONFIG)
VARIANT_DEFCONFIG := $(TARGET_KERNEL_VARIANT_CONFIG)
SELINUX_DEFCONFIG := $(TARGET_KERNEL_SELINUX_CONFIG)
## Internal variables
DTC := $(HOST_OUT_EXECUTABLES)/dtc
KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
DTBO_OUT := $(TARGET_OUT_INTERMEDIATES)/DTBO_OBJ
DTB_OUT := $(TARGET_OUT_INTERMEDIATES)/DTB_OBJ
KERNEL_CONFIG := $(KERNEL_OUT)/.config
KERNEL_RELEASE := $(KERNEL_OUT)/include/config/kernel.release
ifeq ($(KERNEL_ARCH),x86_64)
KERNEL_DEFCONFIG_ARCH := x86
else
KERNEL_DEFCONFIG_ARCH := $(KERNEL_ARCH)
endif
KERNEL_DEFCONFIG_DIR := $(KERNEL_SRC)/arch/$(KERNEL_DEFCONFIG_ARCH)/configs
KERNEL_DEFCONFIG_SRC := $(KERNEL_DEFCONFIG_DIR)/$(KERNEL_DEFCONFIG)
ifneq ($(TARGET_KERNEL_ADDITIONAL_CONFIG),)
KERNEL_ADDITIONAL_CONFIG := $(TARGET_KERNEL_ADDITIONAL_CONFIG)
KERNEL_ADDITIONAL_CONFIG_DEPENDENCY :=
KERNEL_ADDITIONAL_CONFIG_SRC := $(KERNEL_DEFCONFIG_DIR)/$(KERNEL_ADDITIONAL_CONFIG)
ifeq ("$(wildcard $(KERNEL_ADDITIONAL_CONFIG_SRC))","")
$(warning TARGET_KERNEL_ADDITIONAL_CONFIG '$(TARGET_KERNEL_ADDITIONAL_CONFIG)' doesn't exist)
KERNEL_ADDITIONAL_CONFIG_SRC := /dev/null
else
KERNEL_ADDITIONAL_CONFIG_DEPENDENCY := $(KERNEL_ADDITIONAL_CONFIG_SRC)
endif
else
KERNEL_ADDITIONAL_CONFIG_SRC := /dev/null
endif
ifeq ($(BOARD_KERNEL_IMAGE_NAME),)
$(error BOARD_KERNEL_IMAGE_NAME not defined.)
endif
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/$(BOARD_KERNEL_IMAGE_NAME)
ifeq "$(wildcard $(KERNEL_SRC) )" ""
ifneq ($(TARGET_PREBUILT_KERNEL),)
HAS_PREBUILT_KERNEL := true
NEEDS_KERNEL_COPY := true
else
$(foreach cf,$(PRODUCT_COPY_FILES), \
$(eval _src := $(call word-colon,1,$(cf))) \
$(eval _dest := $(call word-colon,2,$(cf))) \
$(ifeq kernel,$(_dest), \
$(eval HAS_PREBUILT_KERNEL := true)))
endif
ifneq ($(HAS_PREBUILT_KERNEL),)
$(warning ***************************************************************)
$(warning * Using prebuilt kernel binary instead of source *)
$(warning * THIS IS DEPRECATED, AND IS NOT ADVISED. *)
$(warning * Please configure your device to download the kernel *)
$(warning * source repository to $(KERNEL_SRC))
$(warning * for more information *)
$(warning ***************************************************************)
FULL_KERNEL_BUILD := false
KERNEL_BIN := $(TARGET_PREBUILT_KERNEL)
else
$(warning ***************************************************************)
$(warning * *)
$(warning * No kernel source found, and no fallback prebuilt defined. *)
$(warning * Please make sure your device is properly configured to *)
$(warning * download the kernel repository to $(KERNEL_SRC))
$(warning * and add the TARGET_KERNEL_CONFIG variable to BoardConfig.mk *)
$(warning * *)
$(warning * As an alternative, define the TARGET_PREBUILT_KERNEL *)
$(warning * variable with the path to the prebuilt binary kernel image *)
$(warning * in your BoardConfig.mk file *)
$(warning * *)
$(warning ***************************************************************)
$(error "NO KERNEL")
endif
else
NEEDS_KERNEL_COPY := true
ifeq ($(TARGET_KERNEL_CONFIG),)
$(warning **********************************************************)
$(warning * Kernel source found, but no configuration was defined *)
$(warning * Please add the TARGET_KERNEL_CONFIG variable to your *)
$(warning * BoardConfig.mk file *)
$(warning **********************************************************)
$(error "NO KERNEL CONFIG")
else
FULL_KERNEL_BUILD := true
KERNEL_BIN := $(TARGET_PREBUILT_INT_KERNEL)
endif
endif
ifeq ($(FULL_KERNEL_BUILD),true)
ifeq ($(NEED_KERNEL_MODULE_ROOT),true)
KERNEL_MODULES_OUT := $(TARGET_ROOT_OUT)
KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_recovery)
KERNEL_MODULE_MOUNTPOINT :=
else ifeq ($(NEED_KERNEL_MODULE_SYSTEM),true)
KERNEL_MODULES_OUT := $(TARGET_OUT)
KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_system)
KERNEL_MODULE_MOUNTPOINT := system
else ifeq ($(NEED_KERNEL_MODULE_VENDOR_OVERLAY),true)
KERNEL_MODULES_OUT := $(TARGET_OUT_PRODUCT)/vendor_overlay/$(PRODUCT_TARGET_VNDK_VERSION)
KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_product)
KERNEL_MODULE_MOUNTPOINT := vendor
$(INSTALLED_PRODUCTIMAGE_TARGET): $(TARGET_PREBUILT_INT_KERNEL)
else
KERNEL_MODULES_OUT := $(TARGET_OUT_VENDOR)
KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_vendor)
KERNEL_MODULE_MOUNTPOINT := vendor
endif
MODULES_INTERMEDIATES := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,kernel_modules)
# Add host bin out dir to path
PATH_OVERRIDE := PATH=$(KERNEL_BUILD_OUT_PREFIX)$(HOST_OUT_EXECUTABLES):$$PATH
ifeq ($(TARGET_KERNEL_CLANG_COMPILE),true)
ifneq ($(TARGET_KERNEL_CLANG_VERSION),)
KERNEL_CLANG_VERSION := clang-$(TARGET_KERNEL_CLANG_VERSION)
else
# Use the default version of clang if TARGET_KERNEL_CLANG_VERSION hasn't been set by the device config
KERNEL_CLANG_VERSION := $(LLVM_PREBUILTS_VERSION)
endif
TARGET_KERNEL_CLANG_PATH ?= $(BUILD_TOP)/prebuilts/clang/host/$(HOST_OS)-x86/$(KERNEL_CLANG_VERSION)
ifeq ($(KERNEL_ARCH),arm64)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=aarch64-linux-gnu-
else ifeq ($(KERNEL_ARCH),arm)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=arm-linux-gnu-
else ifeq ($(KERNEL_ARCH),x86)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=x86_64-linux-gnu-
endif
PATH_OVERRIDE += PATH=$(TARGET_KERNEL_CLANG_PATH)/bin:$$PATH LD_LIBRARY_PATH=$(TARGET_KERNEL_CLANG_PATH)/lib64:$$LD_LIBRARY_PATH
ifeq ($(KERNEL_CC),)
KERNEL_CC := CC="$(CCACHE_BIN) clang"
endif
ifeq ($(KERNEL_LD),)
KERNEL_LD :=
endif
endif
ifneq ($(TARGET_KERNEL_MODULES),)
$(error TARGET_KERNEL_MODULES is no longer supported!)
endif
PATH_OVERRIDE += PATH=$(KERNEL_TOOLCHAIN_PATH_gcc)/bin:$$PATH
# System tools are no longer allowed on 10+
PATH_OVERRIDE += $(TOOLS_PATH_OVERRIDE)
KERNEL_ADDITIONAL_CONFIG_OUT := $(KERNEL_OUT)/.additional_config
# Internal implementation of make-kernel-target
# $(1): output path (The value passed to O=)
# $(2): target to build (eg. defconfig, modules, dtbo.img)
define internal-make-kernel-target
$(PATH_OVERRIDE) $(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_BUILD_OUT_PREFIX)$(1) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_CLANG_TRIPLE) $(KERNEL_CC) $(KERNEL_LD) $(2)
endef
# Make a kernel target
# $(1): The kernel target to build (eg. defconfig, modules, modules_install)
define make-kernel-target
$(call internal-make-kernel-target,$(KERNEL_OUT),$(1))
endef
# Make a DTBO target
# $(1): The DTBO target to build (eg. dtbo.img, defconfig)
define make-dtbo-target
$(call internal-make-kernel-target,$(DTBO_OUT),$(1))
endef
# Make a DTB targets
# $(1): The DTB target to build (eg. dtbs, defconfig)
define make-dtb-target
$(call internal-make-kernel-target,$(DTB_OUT),$(1))
endef
$(KERNEL_ADDITIONAL_CONFIG_OUT): $(KERNEL_ADDITIONAL_CONFIG_DEPENDENCY)
mkdir -p $(KERNEL_OUT)
$(hide) cmp -s $(KERNEL_ADDITIONAL_CONFIG_SRC) $@ || cp $(KERNEL_ADDITIONAL_CONFIG_SRC) $@;
$(KERNEL_CONFIG): $(KERNEL_DEFCONFIG_SRC) $(KERNEL_ADDITIONAL_CONFIG_OUT)
@echo "Building Kernel Config"
$(call make-kernel-target,VARIANT_DEFCONFIG=$(VARIANT_DEFCONFIG) SELINUX_DEFCONFIG=$(SELINUX_DEFCONFIG) $(KERNEL_DEFCONFIG))
$(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
$(call make-kernel-target,oldconfig); \
fi
# Create defconfig build artifact
$(call make-kernel-target,savedefconfig)
$(hide) if [ ! -z "$(KERNEL_ADDITIONAL_CONFIG)" ]; then \
echo "Using additional config '$(KERNEL_ADDITIONAL_CONFIG)'"; \
$(KERNEL_SRC)/scripts/kconfig/merge_config.sh -m -O $(KERNEL_OUT) $(KERNEL_OUT)/.config $(KERNEL_SRC)/arch/$(KERNEL_ARCH)/configs/$(KERNEL_ADDITIONAL_CONFIG); \
$(call make-kernel-target,KCONFIG_ALLCONFIG=$(KERNEL_OUT)/.config alldefconfig); \
fi
$(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_CONFIG) $(DEPMOD) $(DTC)
@echo "Building Kernel Image ($(BOARD_KERNEL_IMAGE_NAME))"
$(call make-kernel-target,$(BOARD_KERNEL_IMAGE_NAME))
$(hide) if grep -q '^CONFIG_OF=y' $(KERNEL_CONFIG); then \
echo "Building DTBs"; \
$(call make-kernel-target,dtbs); \
fi
$(hide) if grep -q '=m' $(KERNEL_CONFIG); then \
echo "Building Kernel Modules"; \
$(call make-kernel-target,modules) || exit "$$?"; \
echo "Installing Kernel Modules"; \
$(call make-kernel-target,INSTALL_MOD_PATH=$(MODULES_INTERMEDIATES) INSTALL_MOD_STRIP=1 modules_install); \
kernel_release=$$(cat $(KERNEL_RELEASE)) \
kernel_modules_dir=$(MODULES_INTERMEDIATES)/lib/modules/$$kernel_release \
$(foreach s, $(TARGET_MODULE_ALIASES),\
$(eval p := $(subst :,$(space),$(s))) \
; mv $$(find $$kernel_modules_dir -name $(word 1,$(p))) $$kernel_modules_dir/$(word 2,$(p))); \
modules=$$(find $$kernel_modules_dir -type f -name '*.ko'); \
($(call build-image-kernel-modules,$$modules,$(KERNEL_MODULES_OUT),$(KERNEL_MODULE_MOUNTPOINT)/,$(KERNEL_DEPMOD_STAGING_DIR))); \
fi
.PHONY: kerneltags
kerneltags: $(KERNEL_CONFIG)
$(call make-kernel-target,tags)
.PHONY: kernelsavedefconfig alldefconfig
kernelsavedefconfig:
mkdir -p $(KERNEL_OUT)
$(call make-kernel-target,$(KERNEL_DEFCONFIG))
env KCONFIG_NOTIMESTAMP=true \
$(call make-kernel-target,savedefconfig)
cp $(KERNEL_OUT)/defconfig $(KERNEL_DEFCONFIG_SRC)
alldefconfig:
mkdir -p $(KERNEL_OUT)
env KCONFIG_NOTIMESTAMP=true \
$(call make-kernel-target,alldefconfig)
ifeq (true,$(filter true, $(TARGET_NEEDS_DTBOIMAGE) $(BOARD_KERNEL_SEPARATED_DTBO)))
ifneq ($(BOARD_CUSTOM_DTBOIMG_MK),)
include $(BOARD_CUSTOM_DTBOIMG_MK)
else
MKDTIMG := $(HOST_OUT_EXECUTABLES)/mkdtimg$(HOST_EXECUTABLE_SUFFIX)
MKDTBOIMG := $(HOST_OUT_EXECUTABLES)/mkdtboimg.py$(HOST_EXECUTABLE_SUFFIX)
$(BOARD_PREBUILT_DTBOIMAGE): $(DTC) $(MKDTIMG) $(MKDTBOIMG)
ifeq ($(BOARD_KERNEL_SEPARATED_DTBO),true)
$(BOARD_PREBUILT_DTBOIMAGE):
@echo "Building dtbo.img"
$(call make-dtbo-target,$(KERNEL_DEFCONFIG))
$(call make-dtbo-target,dtbs)
ifdef BOARD_DTBO_CFG
$(MKDTBOIMG) cfg_create $@ $(BOARD_DTBO_CFG) -d $(DTBO_OUT)/arch/$(KERNEL_ARCH)/boot/dts
else
$(MKDTBOIMG) create $@ --page_size=$(BOARD_KERNEL_PAGESIZE) $(shell find $(DTBO_OUT)/arch/$(KERNEL_ARCH)/boot/dts -type f -name "*.dtbo" | sort)
endif
else
$(BOARD_PREBUILT_DTBOIMAGE):
@echo "Building dtbo.img"
$(call make-dtbo-target,$(KERNEL_DEFCONFIG))
$(call make-dtbo-target,dtbo.img)
endif # BOARD_KERNEL_SEPARATED_DTBO
endif # BOARD_CUSTOM_DTBOIMG_MK
endif # TARGET_NEEDS_DTBOIMAGE/BOARD_KERNEL_SEPARATED_DTBO
ifeq ($(BOARD_INCLUDE_DTB_IN_BOOTIMG),true)
ifeq ($(BOARD_PREBUILT_DTBIMAGE_DIR),)
$(INSTALLED_DTBIMAGE_TARGET): $(DTC)
@echo "Building dtb.img"
$(call make-dtb-target,$(KERNEL_DEFCONFIG))
$(call make-dtb-target,dtbs)
cat $(shell find $(DTB_OUT)/arch/$(KERNEL_ARCH)/boot/dts -type f -name "*.dtb" | sort) > $@
endif # !BOARD_PREBUILT_DTBIMAGE_DIR
endif # BOARD_INCLUDE_DTB_IN_BOOTIMG
endif # FULL_KERNEL_BUILD
## Install it
ifeq ($(NEEDS_KERNEL_COPY),true)
file := $(INSTALLED_KERNEL_TARGET)
ALL_PREBUILT += $(file)
$(file) : $(KERNEL_BIN) | $(ACP)
$(transform-prebuilt-to-target)
ALL_PREBUILT += $(INSTALLED_KERNEL_TARGET)
endif
.PHONY: kernel
kernel: $(INSTALLED_KERNEL_TARGET)
.PHONY: dtboimage
dtboimage: $(INSTALLED_DTBOIMAGE_TARGET)
.PHONY: dtbimage
dtbimage: $(INSTALLED_DTBIMAGE_TARGET)
endif # TARGET_NO_KERNEL
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