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

Enable the DWARF unwinder for stacktraces

modulename: dwarf.ko

configname: CONFIG_DWARF_UNWINDER

Linux Kernel Configuration
└─>Enable the DWARF unwinder for stacktraces
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Enabling this option will make stacktraces more accurate, at
the cost of an increase in overall kernel size.

source code:
arch/sh/kernel/dwarf.c