Kernel debugging

modulename: sstep.ko

configname: CONFIG_DEBUG_KERNEL

Linux Kernel Configuration
└─>Kernel debugging
In linux kernel since version 2.6.12  
Say Y here if you are developing drivers or trying to debug and
identify kernel problems.

source code:
arch/powerpc/lib/sstep.c

is depended by
CONFIG_SB1XXX_CORELIS