Hi Masahiro, what do you think about the series below, which moves the includes of all the architecture independ Kconfig files to the top-level Kconfig instead of duplicating the includes in all architectures? Note that this only handles the low-hanging fruite, there are a lot of other bits that should probably be cleaned up to be common, but those will be not entirely trivial. Changes since v3: - don't allow to select PREEMPT_COUNT for architectures that don't implement it - fix usage of SUBARCH=i386 and SUBARCH=x86_64 for um Changes since v2: - fix the missing sh conversion - handle the lack of CONFIG_SWAP support in microblaze and nios2 properly Changes since v1: - add back a remove source statement from arch/arm/Kconfig - various fixes from Randy - various UML patches to be able to use the common Kconfig