The default DEFCONFIG_<ARCH> may not always work for all architectures, some architectures require to add extra kernel config options, this allows to add extra options in the defconfig target.
Based on the .config generated from DEFCONFIG_<ARCH>, It allows to customize extra kernel config options via both the common common.config and the architecture specific <ARCH>.config, at last trigger 'allnoconfig' to let them take effect with missing config options as disabled.
The scripts/kconfig/merge_config.sh tool is used to merge the extra config files.
Suggested-by: Thomas Weißschuh linux@weissschuh.net Link: https://lore.kernel.org/lkml/67eb70d4-c9ff-4afc-bac7-7f36cc2c81bc@t-8ch.de/ Reviewed-by: Thomas Weißschuh linux@weissschuh.net Signed-off-by: Zhangjin Wu falcon@tinylab.org --- tools/testing/selftests/nolibc/Makefile | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile index f42adef87e12..9576f1a0a98d 100644 --- a/tools/testing/selftests/nolibc/Makefile +++ b/tools/testing/selftests/nolibc/Makefile @@ -39,6 +39,9 @@ DEFCONFIG_s390 = defconfig DEFCONFIG_loongarch = defconfig DEFCONFIG = $(DEFCONFIG_$(ARCH))
+# extra kernel config files under configs/, include common + architecture specific +EXTCONFIG = common.config $(ARCH).config + # optional tests to run (default = all) TEST =
@@ -161,6 +164,8 @@ initramfs: nolibc-test
defconfig: $(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) mrproper $(DEFCONFIG) prepare + $(Q)$(srctree)/scripts/kconfig/merge_config.sh -O "$(srctree)" -m "$(srctree)/.config" $(foreach c,$(EXTCONFIG),$(wildcard $(CURDIR)/configs/$c)) + $(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) KCONFIG_ALLCONFIG="$(srctree)/.config" allnoconfig
kernel: initramfs $(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) $(IMAGE_NAME) CONFIG_INITRAMFS_SOURCE=$(CURDIR)/initramfs