CONFIG_PARISC is not available for thedefaultarchitecture x86.
Result is shown for architecture parisc

CONFIG_PARISC (not configurable)

modulename: setup-bus.ko

configname: CONFIG_PARISC

Linux/PA-RISC Kernel Configuration
└─>PARISC
In linux kernel since version 2.6.12  
The PA-RISC microprocessor is designed by Hewlett-Packard and used
in many of their workstations & servers (HP9000 700 and 800 series,
and later HP3000 series). The PA-RISC Linux project home page is
at <http://www.parisc-linux.org/>.

source code:
drivers/pci/setup-bus.c