CONFIG_S390 is not available for thedefaultarchitecture x86.
Result is shown for architecture s390

CONFIG_S390 (not configurable)

configname: CONFIG_S390

Linux Kernel Configuration
└─>S390
In linux kernel since version 2.6.16 (release Date: 2006-03-19)  
selects
CONFIG_USE_GENERIC_SMP_HELPERS
CONFIG_HAVE_SYSCALL_WRAPPERS
CONFIG_HAVE_FUNCTION_TRACER
CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
CONFIG_HAVE_FTRACE_MCOUNT_RECORD
CONFIG_HAVE_C_RECORDMCOUNT
CONFIG_HAVE_SYSCALL_TRACEPOINTS
CONFIG_HAVE_DYNAMIC_FTRACE
CONFIG_HAVE_FUNCTION_GRAPH_TRACER
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API
CONFIG_HAVE_OPROFILE
CONFIG_HAVE_KPROBES
CONFIG_HAVE_KRETPROBES
CONFIG_HAVE_KVM
CONFIG_HAVE_ARCH_TRACEHOOK
CONFIG_INIT_ALL_POSSIBLE
CONFIG_HAVE_IRQ_WORK
CONFIG_HAVE_PERF_EVENTS
CONFIG_HAVE_KERNEL_GZIP
CONFIG_HAVE_KERNEL_BZIP2
CONFIG_HAVE_KERNEL_LZMA
CONFIG_HAVE_KERNEL_LZO
CONFIG_HAVE_KERNEL_XZ
CONFIG_HAVE_GET_USER_PAGES_FAST
CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX
CONFIG_HAVE_ARCH_JUMP_LABEL
CONFIG_ARCH_INLINE_SPIN_TRYLOCK
CONFIG_ARCH_INLINE_SPIN_TRYLOCK_BH
CONFIG_ARCH_INLINE_SPIN_LOCK
CONFIG_ARCH_INLINE_SPIN_LOCK_BH
CONFIG_ARCH_INLINE_SPIN_LOCK_IRQ
CONFIG_ARCH_INLINE_SPIN_LOCK_IRQSAVE
CONFIG_ARCH_INLINE_SPIN_UNLOCK
CONFIG_ARCH_INLINE_SPIN_UNLOCK_BH
CONFIG_ARCH_INLINE_SPIN_UNLOCK_IRQ
CONFIG_ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
CONFIG_ARCH_INLINE_READ_TRYLOCK
CONFIG_ARCH_INLINE_READ_LOCK
CONFIG_ARCH_INLINE_READ_LOCK_BH
CONFIG_ARCH_INLINE_READ_LOCK_IRQ
CONFIG_ARCH_INLINE_READ_LOCK_IRQSAVE
CONFIG_ARCH_INLINE_READ_UNLOCK
CONFIG_ARCH_INLINE_READ_UNLOCK_BH
CONFIG_ARCH_INLINE_READ_UNLOCK_IRQ
CONFIG_ARCH_INLINE_READ_UNLOCK_IRQRESTORE
CONFIG_ARCH_INLINE_WRITE_TRYLOCK
CONFIG_ARCH_INLINE_WRITE_LOCK
CONFIG_ARCH_INLINE_WRITE_LOCK_BH
CONFIG_ARCH_INLINE_WRITE_LOCK_IRQ
CONFIG_ARCH_INLINE_WRITE_LOCK_IRQSAVE
CONFIG_ARCH_INLINE_WRITE_UNLOCK
CONFIG_ARCH_INLINE_WRITE_UNLOCK_BH
CONFIG_ARCH_INLINE_WRITE_UNLOCK_IRQ
CONFIG_ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE