CONFIG_IO_TRAPPED is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

CONFIG_IO_TRAPPED (not configurable)

modulename: io_trapped.ko

configname: CONFIG_IO_TRAPPED

Linux/SuperH Kernel Configuration
└─>IO_TRAPPED
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
source code:
arch/sh/kernel/io_trapped.c