CONFIG_VIRT_TO_BUS (not configurable)

configname: CONFIG_VIRT_TO_BUS

Linux Kernel Configuration
└─>Memory Management options
└─>VIRT_TO_BUS
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
An architecture should select this if it implements the
deprecated interface virt_to_bus(). All new architectures
should probably not select this.

is selected by
CONFIG_STA2X11_VIP