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_ARCH_BINFMT_ELF_STATE
CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED
CONFIG_ARCH_HAS_ELF_RANDOMIZE
CONFIG_ARCH_HAS_FORTIFY_SOURCE
CONFIG_ARCH_HAS_GCOV_PROFILE_ALL
CONFIG_ARCH_HAS_GIGANTIC_PAGE
CONFIG_ARCH_HAS_KCOV
CONFIG_ARCH_HAS_MEM_ENCRYPT
CONFIG_ARCH_HAS_PTE_SPECIAL
CONFIG_ARCH_HAS_SET_MEMORY
CONFIG_ARCH_HAS_STRICT_KERNEL_RWX
CONFIG_ARCH_HAS_STRICT_MODULE_RWX
CONFIG_ARCH_HAS_SYSCALL_WRAPPER
CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL
CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
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_TRYLOCK
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_SPIN_LOCK
CONFIG_ARCH_INLINE_SPIN_LOCK_BH
CONFIG_ARCH_INLINE_SPIN_LOCK_IRQ
CONFIG_ARCH_INLINE_SPIN_LOCK_IRQSAVE
CONFIG_ARCH_INLINE_SPIN_TRYLOCK
CONFIG_ARCH_INLINE_SPIN_TRYLOCK_BH
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_WRITE_LOCK
CONFIG_ARCH_INLINE_WRITE_LOCK_BH
CONFIG_ARCH_INLINE_WRITE_LOCK_IRQ
CONFIG_ARCH_INLINE_WRITE_LOCK_IRQSAVE
CONFIG_ARCH_INLINE_WRITE_TRYLOCK
CONFIG_ARCH_INLINE_WRITE_UNLOCK
CONFIG_ARCH_INLINE_WRITE_UNLOCK_BH
CONFIG_ARCH_INLINE_WRITE_UNLOCK_IRQ
CONFIG_ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
CONFIG_ARCH_KEEP_MEMBLOCK
CONFIG_ARCH_SAVE_PAGE_KEYS
CONFIG_ARCH_STACKWALK
CONFIG_ARCH_SUPPORTS_ATOMIC_RMW
CONFIG_ARCH_SUPPORTS_NUMA_BALANCING
CONFIG_ARCH_USE_BUILTIN_BSWAP
CONFIG_ARCH_USE_CMPXCHG_LOCKREF
CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
CONFIG_ARCH_WANT_IPC_PARSE_VERSION
CONFIG_BUILDTIME_EXTABLE_SORT
CONFIG_CLONE_BACKWARDS2
CONFIG_DYNAMIC_FTRACE
CONFIG_GENERIC_CLOCKEVENTS
CONFIG_GENERIC_CPU_AUTOPROBE
CONFIG_GENERIC_CPU_VULNERABILITIES
CONFIG_GENERIC_FIND_FIRST_BIT
CONFIG_GENERIC_SMP_IDLE_THREAD
CONFIG_GENERIC_TIME_VSYSCALL
CONFIG_HAVE_ALIGNED_STRUCT_PAGE
CONFIG_HAVE_ARCH_AUDITSYSCALL
CONFIG_HAVE_ARCH_JUMP_LABEL
CONFIG_HAVE_ARCH_JUMP_LABEL_RELATIVE
CONFIG_HAVE_ARCH_KASAN
CONFIG_CPU_NO_EFFICIENT_FFS
CONFIG_HAVE_ARCH_SECCOMP_FILTER
CONFIG_HAVE_ARCH_SOFT_DIRTY
CONFIG_HAVE_ARCH_TRACEHOOK
CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE
CONFIG_HAVE_ARCH_VMAP_STACK
CONFIG_HAVE_ASM_MODVERSIONS
CONFIG_HAVE_EBPF_JIT
CONFIG_HAVE_CMPXCHG_DOUBLE
CONFIG_HAVE_CMPXCHG_LOCAL
CONFIG_HAVE_COPY_THREAD_TLS
CONFIG_HAVE_DEBUG_KMEMLEAK
CONFIG_HAVE_DMA_CONTIGUOUS
CONFIG_HAVE_DYNAMIC_FTRACE
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS
CONFIG_HAVE_FAST_GUP
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
CONFIG_HAVE_FENTRY
CONFIG_HAVE_FTRACE_MCOUNT_RECORD
CONFIG_HAVE_FUNCTION_GRAPH_TRACER
CONFIG_HAVE_FUNCTION_TRACER
CONFIG_HAVE_FUTEX_CMPXCHG
CONFIG_HAVE_GCC_PLUGINS
CONFIG_HAVE_KERNEL_BZIP2
CONFIG_HAVE_KERNEL_GZIP
CONFIG_HAVE_KERNEL_LZ4
CONFIG_HAVE_KERNEL_LZMA
CONFIG_HAVE_KERNEL_LZO
CONFIG_HAVE_KERNEL_UNCOMPRESSED
CONFIG_HAVE_KERNEL_XZ
CONFIG_HAVE_KPROBES
CONFIG_HAVE_KRETPROBES
CONFIG_HAVE_KVM
CONFIG_HAVE_LIVEPATCH
CONFIG_HAVE_PERF_REGS
CONFIG_HAVE_PERF_USER_STACK_DUMP
CONFIG_HAVE_MEMBLOCK_NODE_MAP
CONFIG_HAVE_MEMBLOCK_PHYS_MAP
CONFIG_HAVE_MMU_GATHER_NO_GATHER
CONFIG_HAVE_MOD_ARCH_SPECIFIC
CONFIG_HAVE_NOP_MCOUNT
CONFIG_HAVE_OPROFILE
CONFIG_HAVE_PCI
CONFIG_HAVE_PERF_EVENTS
CONFIG_HAVE_RCU_TABLE_FREE
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API
CONFIG_HAVE_RSEQ
CONFIG_HAVE_SYSCALL_TRACEPOINTS
CONFIG_HAVE_VIRT_CPU_ACCOUNTING
CONFIG_IOMMU_HELPER
CONFIG_IOMMU_SUPPORT
CONFIG_MODULES_USE_ELF_RELA
CONFIG_NEED_DMA_MAP_STATE
CONFIG_NEED_SG_DMA_LENGTH
CONFIG_OLD_SIGACTION
CONFIG_OLD_SIGSUSPEND3
CONFIG_PCI_DOMAINS
CONFIG_PCI_MSI
CONFIG_SPARSE_IRQ
CONFIG_SYSCTL_EXCEPTION_TRACE
CONFIG_THREAD_INFO_IN_TASK
CONFIG_TTY
CONFIG_VIRT_CPU_ACCOUNTING
CONFIG_ARCH_HAS_SCALED_CPUTIME
CONFIG_HAVE_NMI
CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
CONFIG_SWIOTLB
CONFIG_GENERIC_ALLOCATOR