CONFIG_TUNE_G5 is not available for thedefaultarchitecture x86.
Result is shown for architecture s390
default or selected kernelversion does not have config value CONFIG_TUNE_G5.
Result is shown for kernelversion 6.5.1

System/390 model G5 and G6

configname: CONFIG_TUNE_G5

Tune code generation
└─>System/390 model G5 and G6
In linux kernel since version 3.13 (release Date: 2014-01-19)