CONFIG_OPROFILE is not available for thedefaultarchitecture x86.
Result is shown for architecture parisc

OProfile system profiling (EXPERIMENTAL)

modulename: oprofile.ko

configname: CONFIG_OPROFILE

Linux Kernel Configuration
└─>Profiling support
└─>OProfile system profiling (EXPERIMENTAL)
In linux kernel since version 2.6.12  
OProfile is a profiling system capable of profiling the
whole system, include the kernel, kernel modules, libraries,
and applications.

If unsure, say N.

depends
CONFIG_EXPERIMENTAL
CONFIG_PROFILING