CONFIG_HAVE_MARCH_Z900_FEATURES is not available for thedefaultarchitecture x86.
Result is shown for architecture s390

CONFIG_HAVE_MARCH_Z900_FEATURES (not configurable)

configname: CONFIG_HAVE_MARCH_Z900_FEATURES

Linux Kernel Configuration
└─>Processor type and features
└─>HAVE_MARCH_Z900_FEATURES
In linux kernel since version 3.1 (release Date: 2011-10-24)  
is depended by
CONFIG_MARCH_Z900