CONFIG_FRV is not available for thedefaultarchitecture x86.
Result is shown for architecture frv

CONFIG_FRV (not configurable)

modulename: setup-bus.ko

configname: CONFIG_FRV

Linux Kernel Configuration
└─>FRV
In linux kernel since version 2.6.12  
source code:
drivers/pci/setup-bus.c

is selected by
CONFIG_BINFMT_ELF_FDPIC