CONFIG_ARM is not available for the default architecture x86.
Result is shown for architecture arm

CONFIG_ARM (not configurable)

modulename: setup-bus.ko
configname: CONFIG_ARM

Linux Kernel Configuration
└─> ARM

The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and
handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
manufactured, but legacy ARM-based PC hardware remains popular in
Europe. There is an ARM Linux project with a web page at

source code: