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openwrt/include/kernel-build.mk
T
John Crispin 5d5ade6d16 kernel: configure the kernel again after an initramfs build 
Kernel/SetInitramfs writes the initramfs configuration into the kernel
tree and deletes .config.prev, so that the next configure stage puts the
regular configuration back. The check that decides if the configure stage
must run ignored this signal. The next build then compiled the regular
kernel with the initramfs configuration, and the squashfs images got a
kernel with an embedded root filesystem.

Run the configure stage if .config.prev is missing.

Fixes: e97e3f36bd ("kernel: configure the kernel only when an input changed")
Signed-off-by: John Crispin <john@phrozen.org>
2026-10-03 10:07:19 +02:00

239 lines
8.1 KiB
Makefile
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# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2006-2020 OpenWrt.org
include $(INCLUDE_DIR)/prereq.mk
include $(INCLUDE_DIR)/depends.mk
ifneq ($(DUMP),1)
all: compile
endif
KERNEL_FILE_DEPENDS=$(GENERIC_BACKPORT_DIR) $(GENERIC_PATCH_DIR) $(GENERIC_HACK_DIR) $(PATCH_DIR) $(GENERIC_FILES_DIR) $(FILES_DIR)
STAMP_PREPARED=$(LINUX_DIR)/.prepared$(if $(QUILT)$(DUMP),,_$(shell $(call $(if $(CONFIG_AUTOREMOVE),find_md5_reproducible,find_md5),$(KERNEL_FILE_DEPENDS),)))
STAMP_CONFIGURED:=$(LINUX_DIR)/.configured
include $(INCLUDE_DIR)/download.mk
include $(INCLUDE_DIR)/quilt.mk
include $(INCLUDE_DIR)/kernel-defaults.mk
define Kernel/Prepare
$(call Kernel/Prepare/Default)
endef
define Kernel/Configure
$(call Kernel/Configure/Default)
endef
define Kernel/CompileModules
$(call Kernel/CompileModules/Default)
endef
define Kernel/CompileImage
$(call Kernel/CompileImage/Default)
$(call Kernel/CompileImage/Initramfs)
endef
define Kernel/Clean
$(call Kernel/Clean/Default)
endef
define Download/kernel
URL:=$(LINUX_SITE)
FILE:=$(LINUX_SOURCE)
HASH:=$(LINUX_KERNEL_HASH)
endef
KERNEL_GIT_OPTS:=
ifneq ($(strip $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)),"")
KERNEL_GIT_OPTS+=--reference $(CONFIG_KERNEL_GIT_LOCAL_REPOSITORY)
endif
define Download/git-kernel
URL:=$(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI))
PROTO:=git
SOURCE_VERSION:=$(CONFIG_KERNEL_GIT_REF)
FILE:=$(LINUX_SOURCE)
SUBDIR:=linux-$(LINUX_VERSION)
OPTS:=$(KERNEL_GIT_OPTS)
endef
ifdef CONFIG_COLLECT_KERNEL_DEBUG
define Kernel/CollectDebug
rm -rf $(KERNEL_BUILD_DIR)/debug
mkdir -p $(KERNEL_BUILD_DIR)/debug/modules
$(CP) $(LINUX_DIR)/vmlinux $(KERNEL_BUILD_DIR)/debug/
-$(CP) \
$(STAGING_DIR_ROOT)/lib/modules/$(LINUX_VERSION)/*.ko \
$(KERNEL_BUILD_DIR)/debug/modules/
$(FIND) $(KERNEL_BUILD_DIR)/debug -type f | $(XARGS) $(KERNEL_CROSS)strip --only-keep-debug
$(TAR) c -C $(KERNEL_BUILD_DIR) debug \
$(if $(SOURCE_DATE_EPOCH),--mtime="@$(SOURCE_DATE_EPOCH)") \
| zstd -T0 -f -o $(BIN_DIR)/kernel-debug.tar.zst
endef
endif
ifeq ($(DUMP)$(filter prereq clean refresh update,$(MAKECMDGOALS)),)
ifneq ($(if $(QUILT),,$(CONFIG_AUTOREBUILD)),)
define Kernel/Autoclean
$(PKG_BUILD_DIR)/.dep_files: $(STAMP_PREPARED)
$(call rdep,$(KERNEL_FILE_DEPENDS),$(STAMP_PREPARED),$(PKG_BUILD_DIR)/.dep_files,-x "*/.dep_*")
endef
endif
endif
KERNEL_CONFIG_CHECK:=$(LINUX_DIR)/.configured-check
KERNEL_CONFIG_DEPENDS:=$(LINUX_KCONFIG_LIST) $(TOPDIR)/.config $(TMP_DIR)/.packageinfo \
$(SCRIPT_DIR)/kconfig.pl $(SCRIPT_DIR)/package-metadata.pl $(SCRIPT_DIR)/metadata.pm \
$(INCLUDE_DIR)/kernel-defaults.mk $(INCLUDE_DIR)/kernel-build.mk $(CURDIR)
IMAGE_INSTALL_STAMP:=$(KERNEL_BUILD_DIR)/.image_install
IMAGE_INSTALL_INPUTS:=$(LINUX_DIR) $(STAGING_DIR)/image \
$(STAGING_DIR_HOST)/bin $(CURDIR) $(INCLUDE_DIR) $(SCRIPT_DIR) $(TOPDIR)/.config
IMAGE_INSTALL_PRUNE:=\( -path '$(LINUX_DIR)/.*' ! -path '$(LINUX_DIR)/.config' \)
image_install_state = ( \
cd $(TARGET_DIR) && \
find . -printf '%P %y %m %U %G %s %l\n' | LC_ALL=C sort && \
find . -type f -print0 | LC_ALL=C sort -z | xargs -0 -r cat; \
) | $(MKHASH) sha256; \
find $(BIN_DIR) -maxdepth 1 -type f \
! -name sha256sums ! -name profiles.json ! -name '*.buildinfo' \
-printf '%f %s\n' 2>/dev/null | LC_ALL=C sort; \
find $(BUILD_DIR)/json_info_files -maxdepth 1 -type f \
-printf '%f %s\n' 2>/dev/null | LC_ALL=C sort
image_install_newer = \
find $(KERNEL_BUILD_DIR) -maxdepth 1 ! -type d \
-newer $(IMAGE_INSTALL_STAMP) -print -quit 2>/dev/null; \
find $(IMAGE_INSTALL_INPUTS) $(IMAGE_INSTALL_PRUNE) -prune -o \
! -type d -newer $(IMAGE_INSTALL_STAMP) -print -quit 2>/dev/null
define BuildKernel
$(if $(QUILT),$(Build/Quilt))
$(if $(LINUX_SITE),$(call Download,kernel))
$(if $(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI)),$(call Download,git-kernel))
.NOTPARALLEL:
$(Kernel/Autoclean)
$(STAMP_PREPARED): $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
$(call BuildTimeLog,begin,prepare)
-rm -rf $(KERNEL_BUILD_DIR)
-mkdir -p $(KERNEL_BUILD_DIR)
$(Kernel/Prepare)
touch $$@
$(call BuildTimeLog,end,prepare)
$(KERNEL_BUILD_DIR)/symtab.h: FORCE
$(call BuildTimeLog,begin,compile)
rm -f $(KERNEL_BUILD_DIR)/symtab.h
touch $(KERNEL_BUILD_DIR)/symtab.h
+$(KERNEL_MAKE) vmlinux
find $(LINUX_DIR) $(STAGING_DIR_ROOT)/lib/modules -name \*.ko | \
xargs $(TARGET_CROSS)nm | \
awk '$$$$1 == "U" { print $$$$2 } ' | \
sort -u > $(KERNEL_BUILD_DIR)/mod_symtab.txt
$(TARGET_CROSS)nm -n $(LINUX_DIR)/vmlinux.o | awk '/^[0-9a-f]+ [rR] __ksymtab_/ {print substr($$$$3,11)}' > $(KERNEL_BUILD_DIR)/kernel_symtab.txt
grep -Ff $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_include.txt
grep -Fvf $(KERNEL_BUILD_DIR)/mod_symtab.txt $(KERNEL_BUILD_DIR)/kernel_symtab.txt > $(KERNEL_BUILD_DIR)/sym_exclude.txt
( \
echo '#define SYMTAB_KEEP \'; \
cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
awk '{print "KEEP(*(___ksymtab+" $$$$1 ")) \\" }'; \
echo; \
echo '#define SYMTAB_KEEP_GPL \'; \
cat $(KERNEL_BUILD_DIR)/sym_include.txt | \
awk '{print "KEEP(*(___ksymtab_gpl+" $$$$1 ")) \\" }'; \
echo; \
echo '#define SYMTAB_DISCARD \'; \
cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
awk '{print "*(___ksymtab+" $$$$1 ") \\" }'; \
echo; \
echo '#define SYMTAB_DISCARD_GPL \'; \
cat $(KERNEL_BUILD_DIR)/sym_exclude.txt | \
awk '{print "*(___ksymtab_gpl+" $$$$1 ") \\" }'; \
echo; \
) > $$@
$(call BuildTimeLog,end,compile)
$(KERNEL_CONFIG_CHECK): $(STAMP_PREPARED) $(LINUX_KCONFIG_LIST) $(TOPDIR)/.config FORCE
@mkdir -p $(LINUX_DIR)
@[ -f $(STAMP_CONFIGURED) ] && [ -d $(LINUX_DIR)/user_headers ] && \
[ -f $(LINUX_DIR)/.config.prev ] && \
[ -z "$$$$(find $(KERNEL_CONFIG_DEPENDS) ! -type d \
-newer $(STAMP_CONFIGURED) -print -quit 2>/dev/null)" ] || \
touch $$@
$(STAMP_CONFIGURED): $(KERNEL_CONFIG_CHECK)
$(call BuildTimeLog,begin,configure)
$(Kernel/Configure)
touch $$@
$(call BuildTimeLog,end,configure)
$(LINUX_DIR)/.modules: export STAGING_PREFIX=$$(STAGING_DIR_HOST)
$(LINUX_DIR)/.modules: export PKG_CONFIG_PATH=$$(STAGING_DIR_HOST)/lib/pkgconfig
$(LINUX_DIR)/.modules: export PKG_CONFIG_LIBDIR=$$(STAGING_DIR_HOST)/lib/pkgconfig
$(LINUX_DIR)/.modules: export FAIL_ON_UNCONFIGURED=1
$(LINUX_DIR)/.modules: $(STAMP_CONFIGURED) $(LINUX_DIR)/.config FORCE
$(call BuildTimeLog,begin,compile)
$(Kernel/CompileModules)
touch $$@
$(call BuildTimeLog,end,compile)
$(LINUX_DIR)/.image: export STAGING_PREFIX=$$(STAGING_DIR_HOST)
$(LINUX_DIR)/.image: export PKG_CONFIG_PATH=$$(STAGING_DIR_HOST)/lib/pkgconfig
$(LINUX_DIR)/.image: export PKG_CONFIG_LIBDIR=$$(STAGING_DIR_HOST)/lib/pkgconfig
$(LINUX_DIR)/.image: $(STAMP_CONFIGURED) $(if $(CONFIG_STRIP_KERNEL_EXPORTS),$(KERNEL_BUILD_DIR)/symtab.h) FORCE
$(call BuildTimeLog,begin,compile)
$(Kernel/CompileImage)
$(Kernel/CollectDebug)
touch $$@
$(call BuildTimeLog,end,compile)
mostlyclean: FORCE
$(Kernel/Clean)
define BuildKernel
endef
download: $(if $(LINUX_SITE),$(DL_DIR)/$(LINUX_SOURCE))
prepare: $(STAMP_PREPARED)
compile: $(LINUX_DIR)/.modules
+$(MAKE) -C image compile TARGET_BUILD=
dtb: $(STAMP_CONFIGURED)
$(_SINGLE)$(KERNEL_MAKE) scripts_dtc
$(MAKE) -C image compile-dtb TARGET_BUILD=
oldconfig menuconfig nconfig xconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
rm -f $(LINUX_DIR)/.config.prev
rm -f $(STAMP_CONFIGURED)
$(LINUX_RECONF_CMD) > $(LINUX_DIR)/.config
$(_SINGLE)$(KERNEL_MAKE) \
$(if $(findstring Darwin,$(HOST_OS)), \
HOSTLDLIBS_mconf="-L$(STAGING_DIR_HOST)/lib -lncurses" \
filechk_conf_cfg=" :" \
) \
YACC=$(STAGING_DIR_HOST)/bin/bison \
$$@
$(call LINUX_RECONF_DIFF,$(LINUX_DIR)/.config) > $(LINUX_RECONFIG_TARGET)
install: $(LINUX_DIR)/.image
+{ \
state="$$$$( $(image_install_state) )"; \
[ "$$$$state" = "$$$$(cat $(IMAGE_INSTALL_STAMP) 2>/dev/null)" ] && \
[ -z "$$$$($(image_install_newer))" ] || { \
rm -f $(IMAGE_INSTALL_STAMP); \
$(MAKE) -C image compile install TARGET_BUILD= && \
{ $(image_install_state); } > $(IMAGE_INSTALL_STAMP); \
}; \
}
clean: FORCE
rm -rf $(KERNEL_BUILD_DIR)
image-prereq:
@+$(NO_TRACE_MAKE) -s -C image prereq TARGET_BUILD=
prereq: image-prereq
endef
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