CONFIG_GPROF is not available for thedefaultarchitecture x86.
Result is shown for architecture um

Enable gprof support

modulename: gprof_syms.ko

configname: CONFIG_GPROF

Linux Kernel Configuration
└─>Enable gprof support
In linux kernel since version 2.6.12  
This allows profiling of a User-Mode Linux kernel with the gprof

See <> for more

If you're involved in UML kernel development and want to use gprof,
say Y. If you're unsure, say N.

source code: