[OpenWrt-Devel] [PATCH v4 3/4] kernel: Use defconfig instead of full fledged kernel configuration

[Maxime Ripard]

Rely on the Kconfig defconfig mechanism to fill all the missing options,
instead of needing to set them all in the kernel configurations like what was
previously done.

This will allow to trim down a lot the configuration files, avoid carrying
unused configuration options and preserve the developers mental health.

Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
---
 include/kernel-defaults.mk | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/include/kernel-defaults.mk b/include/kernel-defaults.mk
index d6c892462359..cc03e31efab4 100644
--- a/include/kernel-defaults.mk
+++ b/include/kernel-defaults.mk
@@ -100,16 +100,24 @@ define Kernel/SetNoInitramfs
 	echo 'CONFIG_INITRAMFS_SOURCE=""' >> $(LINUX_DIR)/.config
 endef
 
+DEFCONFIG_DIR = $(LINUX_DIR)/arch/$(LINUX_KARCH)/configs
+DEFCONFIG_NAME = openwrt_defconfig
+
 define Kernel/Configure/Default
-	$(LINUX_CONF_CMD) > $(LINUX_DIR)/.config.target
+	$(LINUX_CONF_CMD) > $(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).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 is not set" >> $(LINUX_DIR)/.config.target
-	echo "# CONFIG_KPROBES is not set" >> $(LINUX_DIR)/.config.target
-	$(SCRIPT_DIR)/metadata.pl kconfig $(TMP_DIR)/.packageinfo $(TOPDIR)/.config > $(LINUX_DIR)/.config.override
-	$(SCRIPT_DIR)/kconfig.pl 'm+' '+' $(LINUX_DIR)/.config.target /dev/null $(LINUX_DIR)/.config.override > $(LINUX_DIR)/.config
+	awk '/^(#[[:space:]]+)?CONFIG_KERNEL/{sub("CONFIG_KERNEL_","CONFIG_");print}' \
+		$(TOPDIR)/.config >> $(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).target
+	echo "# CONFIG_KALLSYMS_EXTRA_PASS is not set" >> $(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).target
+	echo "# CONFIG_KALLSYMS_ALL is not set" >> $(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).target
+	echo "# CONFIG_KALLSYMS_UNCOMPRESSED is not set" >> $(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).target
+	echo "# CONFIG_KPROBES is not set" >> $(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).target
+	$(SCRIPT_DIR)/metadata.pl kconfig $(TMP_DIR)/.packageinfo $(TOPDIR)/.config > \
+		$(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).override
+	$(SCRIPT_DIR)/kconfig.pl 'm+' '+' $(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).target \
+		 /dev/null $(DEFCONFIG_DIR)/$(DEFCONFIG_NAME).override > \
+		$(DEFCONFIG_DIR)/$(DEFCONFIG_NAME)
+	+$(MAKE) $(KERNEL_MAKEOPTS) $(DEFCONFIG_NAME)
 	$(call Kernel/SetNoInitramfs)
 	rm -rf $(KERNEL_BUILD_DIR)/modules
 	$(_SINGLE) [ -d $(LINUX_DIR)/user_headers ] || $(MAKE) $(KERNEL_MAKEOPTS) INSTALL_HDR_PATH=$(LINUX_DIR)/user_headers headers_install
-- 
2.2.0
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