CONFIG_ARM_UNWIND is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_ARM_UNWIND (not configurable)

modulename: unwind.ko

configname: CONFIG_ARM_UNWIND

Linux Kernel Configuration
└─>ARM_UNWIND
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
source code:
arch/arm/kernel/unwind.c