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When using a defconfig, using yes '' | make oldconfig may not result in the correct configuration being set. For example: $ ARCH=mips make qi_lb60_defconfig # # configuration written to .config # $ grep USB_ETH .config CONFIG_USB_ETH=y # CONFIG_USB_ETH_RNDIS is not set # CONFIG_USB_ETH_EEM is not set $ cp arch/mips/configs/qi_lb60_defconfig .config $ yes '' | make ARCH=mips oldconfig [...] $ grep USB_ETH .config CONFIG_USB_ETH=m # CONFIG_USB_ETH_RNDIS is not set # CONFIG_USB_ETH_EEM is not set Using make olddefconfig solves that but we'll use the oldnoconfig alias for backward compatibility with older kernels. $ cp arch/mips/configs/qi_lb60_defconfig .config $ make ARCH=mips oldnoconfig scripts/kconfig/conf --olddefconfig Kconfig # # configuration written to .config # $ grep USB_ETH .config CONFIG_USB_ETH=y # CONFIG_USB_ETH_RNDIS is not set # CONFIG_USB_ETH_EEM is not set (From OE-Core rev: 9b75f6a5786ff7b2e6219d78b38f0032f100c660) Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>