CONFIG_ARCH_S390X is not available for thedefaultarchitecture x86.
Result is shown for architecture s390
64 bit kernel
modulename: entry64.ko
configname: CONFIG_ARCH_S390X
Linux Kernel Configuration
└─>Base setup
└─>64 bit kernel
In linux kernel since version 2.6.12
Select this option if you have a 64 bit IBM zSeries machine
and want to use the 64 bit addressing mode.
and want to use the 64 bit addressing mode.