CONFIG_MN10300 is not available for thedefaultarchitecture x86.
Result is shown for architecture mn10300

CONFIG_MN10300 (not configurable)

modulename: setup-bus.ko

configname: CONFIG_MN10300

Linux Kernel Configuration
└─>MN10300
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
source code:
drivers/pci/setup-bus.c

is selected by
CONFIG_SMC91X