CONFIG_GENERIC_TIME_VSYSCALL is not available for thedefaultarchitecture x86.
Result is shown for architecture ia64

CONFIG_GENERIC_TIME_VSYSCALL (not configurable)

configname: CONFIG_GENERIC_TIME_VSYSCALL

IA-64 Linux Kernel Configuration
└─>Processor type and features
└─>GENERIC_TIME_VSYSCALL
In linux kernel since version 2.6.21 (release Date: 2007-04-25)