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openwrt/include/kernel-defaults.mk
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John Crispin 714886f3e4 kernel: build the separate initramfs kernel only once 
With TARGET_ROOTFS_INITRAMFS_SEPARATE, the initramfs kernel differs
from the regular kernel only in CONFIG_RD_<ALGO>. Both are built in the
same tree, so every build switches the kernel config twice and relinks
vmlinux twice, even if nothing changed.

Give the regular kernel the same ramdisk support and use its image for
the initramfs as is. The initramfs step now only creates the initrd.
Remove the separate initramfs branches of Kernel/SetInitramfs, as it is
no longer called in this mode.

Signed-off-by: John Crispin <john@phrozen.org>
2026-09-22 18:18:58 +02:00

230 lines
9.7 KiB
Makefile
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# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2006-2020 OpenWrt.org
ifdef CONFIG_STRIP_KERNEL_EXPORTS
KERNEL_MAKEOPTS_IMAGE += \
EXTRA_LDSFLAGS="-I$(KERNEL_BUILD_DIR) -include symtab.h"
endif
INITRAMFS_EXTRA_FILES ?= $(GENERIC_PLATFORM_DIR)/image/initramfs-base-files.txt
export HOST_EXTRACFLAGS=-I$(STAGING_DIR_HOST)/include
# defined in quilt.mk
Kernel/Patch:=$(Kernel/Patch/Default)
ifneq (,$(findstring .xz,$(LINUX_SOURCE)))
LINUX_CAT:=xzcat
else
LINUX_CAT:=$(STAGING_DIR_HOST)/bin/libdeflate-gzip -dc
endif
ifeq ($(strip $(CONFIG_EXTERNAL_KERNEL_TREE)),"")
ifeq ($(strip $(CONFIG_KERNEL_GIT_CLONE_URI)),"")
define Kernel/Prepare/Default
$(LINUX_CAT) $(DL_DIR)/$(LINUX_SOURCE) | $(TAR) -C $(KERNEL_BUILD_DIR) $(TAR_OPTIONS)
$(Kernel/Patch)
endef
else
define Kernel/Prepare/Default
$(LINUX_CAT) $(DL_DIR)/$(LINUX_SOURCE) | $(TAR) -C $(KERNEL_BUILD_DIR) $(TAR_OPTIONS)
endef
endif
else
define Kernel/Prepare/Default
mkdir -p $(KERNEL_BUILD_DIR)
if [ -d $(LINUX_DIR) ]; then \
rmdir $(LINUX_DIR); \
fi
ln -s $(CONFIG_EXTERNAL_KERNEL_TREE) $(LINUX_DIR)
if [ -d $(LINUX_DIR)/user_headers ]; then \
rm -rf $(LINUX_DIR)/user_headers; \
fi
endef
endif
ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),y)
ifeq ($(strip $(CONFIG_EXTERNAL_CPIO)),"")
define Kernel/SetInitramfs/PreConfigure
{ \
grep -v -e INITRAMFS -e CONFIG_RD_ -e CONFIG_BLK_DEV_INITRD $(2)/.config.old > $(2)/.config; \
echo 'CONFIG_BLK_DEV_INITRD=y' >> $(2)/.config; \
echo 'CONFIG_INITRAMFS_SOURCE="$(strip $(1) $(INITRAMFS_EXTRA_FILES))"' >> $(2)/.config; \
}
endef
else
define Kernel/SetInitramfs/PreConfigure
{ \
grep -v INITRAMFS $(2)/.config.old > $(2)/.config; \
echo 'CONFIG_INITRAMFS_SOURCE="$(call qstrip,$(CONFIG_EXTERNAL_CPIO))"' >> $(2)/.config; \
}
endef
endif
define Kernel/SetInitramfs
{ \
rm -f $(2)/.config.prev; \
mv $(2)/.config $(2)/.config.old; \
$(call Kernel/SetInitramfs/PreConfigure,$(1),$(2)); \
echo "# CONFIG_INITRAMFS_PRESERVE_MTIME is not set" >> $(2)/.config; \
echo "CONFIG_INITRAMFS_ROOT_UID=$(shell id -u)" >> $(2)/.config; \
echo "CONFIG_INITRAMFS_ROOT_GID=$(shell id -g)" >> $(2)/.config; \
$(if $(CONFIG_TARGET_INITRAMFS_FORCE), \
echo "CONFIG_INITRAMFS_FORCE=y" >> $(2)/.config;, \
echo "# CONFIG_INITRAMFS_FORCE is not set" >> $(2)/.config;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_NONE), \
echo "CONFIG_INITRAMFS_COMPRESSION_NONE=y" >> $(2)/.config;, \
echo "# CONFIG_INITRAMFS_COMPRESSION_NONE is not set" >> $(2)/.config; ) \
$(foreach ALGO,GZIP BZIP2 LZMA LZO XZ LZ4 ZSTD, \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_$(ALGO)), \
echo "CONFIG_INITRAMFS_COMPRESSION_$(ALGO)=y" >> $(2)/.config; $\, \
echo "# CONFIG_INITRAMFS_COMPRESSION_$(ALGO) is not set" >> $(2)/.config; $\) \
) \
$(call Kernel/SetRamdiskCompression,$(2)/.config) \
}
endef
else
endif
define Kernel/SetRamdiskCompression
$(foreach ALGO,GZIP BZIP2 LZMA LZO XZ LZ4 ZSTD, \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_$(ALGO)), \
echo "CONFIG_RD_$(ALGO)=y" >> $(1); $\, \
echo "# CONFIG_RD_$(ALGO) is not set" >> $(1); $\) \
)
endef
# With a separate initramfs, the initramfs kernel differs from the regular
# kernel only in ramdisk support. Enable it here too, so that one kernel
# build serves both images.
define Kernel/SetNoInitramfs
mv $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.old
grep -v INITRAMFS $(LINUX_DIR)/.config.old > $(LINUX_DIR)/.config.set
echo 'CONFIG_INITRAMFS_SOURCE=""' >> $(LINUX_DIR)/.config.set
echo '# CONFIG_INITRAMFS_FORCE is not set' >> $(LINUX_DIR)/.config.set
echo "# CONFIG_INITRAMFS_PRESERVE_MTIME is not set" >> $(LINUX_DIR)/.config.set
$(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE), \
echo 'CONFIG_BLK_DEV_INITRD=y' >> $(LINUX_DIR)/.config.set; \
$(call Kernel/SetRamdiskCompression,$(LINUX_DIR)/.config.set))
endef
define Kernel/Configure/Default
rm -f $(LINUX_DIR)/localversion
$(LINUX_CONF_CMD) > $(LINUX_DIR)/.config.target
# copy CONFIG_KERNEL_* settings over to .config.target
awk '/^(#[[:space:]]+)?CONFIG_KERNEL/{sub("CONFIG_KERNEL_","CONFIG_");print}' $(TOPDIR)/.config >> $(LINUX_DIR)/.config.target
echo "# CONFIG_KALLSYMS_EXTRA_PASS is not set" >> $(LINUX_DIR)/.config.target
echo "# CONFIG_KALLSYMS_ALL is not set" >> $(LINUX_DIR)/.config.target
echo "CONFIG_KALLSYMS_UNCOMPRESSED=y" >> $(LINUX_DIR)/.config.target
$(SCRIPT_DIR)/package-metadata.pl kconfig $(TMP_DIR)/.packageinfo $(TOPDIR)/.config $(KERNEL_PATCHVER) > $(LINUX_DIR)/.config.override
$(SCRIPT_DIR)/kconfig.pl 'm+' '+' $(LINUX_DIR)/.config.target /dev/null $(LINUX_DIR)/.config.override > $(LINUX_DIR)/.config.set
$(call Kernel/SetNoInitramfs)
rm -rf $(KERNEL_BUILD_DIR)/modules
cmp -s $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.prev || { \
cp $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config; \
cp $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.prev; \
}
$(_SINGLE) [ -d $(LINUX_DIR)/user_headers ] || $(KERNEL_MAKE) $(if $(findstring uml,$(BOARD)),ARCH=$(ARCH)) INSTALL_HDR_PATH=$(LINUX_DIR)/user_headers headers_install
grep '=[ym]' $(LINUX_DIR)/.config.set | LC_ALL=C sort | $(MKHASH) md5 > $(LINUX_DIR)/.vermagic
endef
define Kernel/Configure/Initramfs
$(call Kernel/SetInitramfs,$(1),$(2))
endef
define Kernel/CompileModules/Default
rm -f $(LINUX_DIR)/vmlinux $(LINUX_DIR)/System.map
+$(KERNEL_MAKE) $(if $(KERNELNAME),$(KERNELNAME),all) modules
# If .config did not change, use the previous timestamp to avoid package rebuilds
cmp -s $(LINUX_DIR)/.config $(LINUX_DIR)/.config.modules.save && \
mv $(LINUX_DIR)/.config.modules.save $(LINUX_DIR)/.config; \
$(CP) $(LINUX_DIR)/.config $(LINUX_DIR)/.config.modules.save
endef
OBJCOPY_STRIP = -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id
# AMD64 shares the location with x86
ifeq ($(LINUX_KARCH),x86_64)
IMAGES_DIR:=../../x86/boot
endif
# $1: image suffix
# $2: Per Device Rootfs ID
define Kernel/CopyImage
cmp -s $(LINUX_DIR)$(2)/vmlinux $(KERNEL_BUILD_DIR)/vmlinux$(1).debug$(2) || { \
$(KERNEL_CROSS)objcopy -O binary $(OBJCOPY_STRIP) -S $(LINUX_DIR)$(2)/vmlinux $(LINUX_KERNEL)$(1)$(2); \
$(KERNEL_CROSS)objcopy $(OBJCOPY_STRIP) -S $(LINUX_DIR)$(2)/vmlinux $(KERNEL_BUILD_DIR)/vmlinux$(1).elf$(2); \
$(CP) $(LINUX_DIR)$(2)/vmlinux $(KERNEL_BUILD_DIR)/vmlinux$(1).debug$(2); \
$(foreach k, \
$(if $(KERNEL_IMAGES),$(KERNEL_IMAGES),$(filter-out vmlinux dtbs,$(KERNELNAME))), \
$(CP) $(LINUX_DIR)$(2)/arch/$(LINUX_KARCH)/boot/$(IMAGES_DIR)/$(k) $(KERNEL_BUILD_DIR)/$(k)$(1)$(2); \
) \
}
endef
define Kernel/CompileImage/Default
rm -f $(TARGET_DIR)/init
+$(KERNEL_MAKE) $(KERNEL_MAKEOPTS_IMAGE) $(if $(KERNELNAME),$(KERNELNAME),all)
$(call Kernel/CopyImage)
endef
define Kernel/PrepareConfigPerRootfs
{ \
[ ! -d "$(1)" ] || rm -rf $(1); \
mkdir $(1) && $(CP) -T $(LINUX_DIR) $(1); \
touch $(1)/.config; \
}
endef
ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
# $1: Custom TARGET_DIR. If omitted TARGET_DIR is used.
# $2: If defined Generate Per Rootfs Kernel Directory and use it
# For Separate Initramfs, the regular kernel is used as is, as its config
# already has the ramdisk support (see Kernel/SetNoInitramfs)
define Kernel/CompileImage/Initramfs
$(call locked,{ \
$(if $(2),$(call Kernel/PrepareConfigPerRootfs,$(LINUX_DIR)$(2));) \
$(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE),, \
$(call Kernel/Configure/Initramfs,$(if $(1),$(1),$(TARGET_DIR)),$(LINUX_DIR)$(2)); \
rm -rf $(LINUX_DIR)$(2)/usr/initramfs_data.cpio*;) \
$(CP) $(GENERIC_PLATFORM_DIR)/other-files/init $(if $(1),$(1),$(TARGET_DIR))/init; \
$(if $(SOURCE_DATE_EPOCH),touch -hcd "@$(SOURCE_DATE_EPOCH)" $(if $(1),$(1),$(TARGET_DIR)) $(if $(1),$(1),$(TARGET_DIR))/init;) \
$(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE), \
$(call locked,{ \
$(if $(call qstrip,$(CONFIG_EXTERNAL_CPIO)), \
$(CP) $(CONFIG_EXTERNAL_CPIO) $(KERNEL_BUILD_DIR)/initrd$(2).cpio;,\
( cd $(if $(1),$(1),$(TARGET_DIR)); find . | LC_ALL=C sort | $(STAGING_DIR_HOST)/bin/cpio --reproducible -o -H newc -R 0:0 > $(KERNEL_BUILD_DIR)/initrd$(2).cpio );) \
$(if $(SOURCE_DATE_EPOCH), \
touch -hcd "@$(SOURCE_DATE_EPOCH)" $(KERNEL_BUILD_DIR)/initrd$(2).cpio;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_BZIP2), \
$(STAGING_DIR_HOST)/bin/bzip2 -9 -c < $(KERNEL_BUILD_DIR)/initrd$(2).cpio > $(KERNEL_BUILD_DIR)/initrd$(2).cpio.bzip2;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_GZIP), \
$(STAGING_DIR_HOST)/bin/libdeflate-gzip -n -f -S .gzip -12 $(KERNEL_BUILD_DIR)/initrd$(2).cpio;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZ4), \
$(STAGING_DIR_HOST)/bin/lz4c -l -c1 -fz --favor-decSpeed $(KERNEL_BUILD_DIR)/initrd$(2).cpio $(KERNEL_BUILD_DIR)/initrd$(2).cpio.lz4;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZMA), \
$(STAGING_DIR_HOST)/bin/lzma e -lc1 -lp2 -pb2 $(KERNEL_BUILD_DIR)/initrd$(2).cpio $(KERNEL_BUILD_DIR)/initrd$(2).cpio.lzma;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZO), \
$(STAGING_DIR_HOST)/bin/lzop -9 -f $(KERNEL_BUILD_DIR)/initrd$(2).cpio;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_XZ), \
$(STAGING_DIR_HOST)/bin/xz -T$(if $(filter 1,$(NPROC)),2,0) -9 -fz --check=crc32 $(KERNEL_BUILD_DIR)/initrd$(2).cpio;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_ZSTD), \
$(STAGING_DIR_HOST)/bin/zstd -T0 -f -o $(KERNEL_BUILD_DIR)/initrd$(2).cpio.zstd $(KERNEL_BUILD_DIR)/initrd$(2).cpio;) \
}, gen-cpio$(2));,\
$(KERNEL_MAKE) $(if $(2),-C $(LINUX_DIR)$(2)) $(KERNEL_MAKEOPTS_IMAGE) $(if $(KERNELNAME),$(KERNELNAME),all);) \
$(call Kernel/CopyImage,-initramfs,$(2)); \
$(if $(2),rm -rf $(LINUX_DIR)$(2);) \
}, gen-initramfs$(2));
endef
else
define Kernel/CompileImage/Initramfs
endef
endif
define Kernel/Clean/Default
rm -f $(KERNEL_BUILD_DIR)/linux-$(LINUX_VERSION)/.configured
rm -f $(LINUX_KERNEL)
$(_SINGLE)$(MAKE) -C $(KERNEL_BUILD_DIR)/linux-$(LINUX_VERSION) clean
endef
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