CONFIG_DMABOUNCE is not available for the selected architecture x86.
Result is shown for architecture arm

CONFIG_DMABOUNCE (not configurable)

modulename: dmabounce.ko

configname: CONFIG_DMABOUNCE

Linux Kernel Configuration
└─>DMABOUNCE
In linux kernel since version 2.6.12 )
source code:
arch/arm/common/dmabounce.c
selects
CONFIG_ZONE_DMA

is depended by
CONFIG_ARCH_IXP4XX