CONFIG_UML is not available for thedefaultarchitecture x86.
Result is shown for architecture um
CONFIG_UML (not configurable)
configname: CONFIG_UML
Linux Kernel Configuration
└─>UML
In linux kernel since version 2.6.12
selects
CONFIG_ARCH_HAS_KCOV
CONFIG_ARCH_NO_PREEMPT
CONFIG_HAVE_ARCH_AUDITSYSCALL
CONFIG_HAVE_ARCH_SECCOMP_FILTER
CONFIG_HAVE_UID16
CONFIG_HAVE_FUTEX_CMPXCHG
CONFIG_HAVE_DEBUG_KMEMLEAK
CONFIG_GENERIC_IRQ_SHOW
CONFIG_GENERIC_CPU_DEVICES
CONFIG_GENERIC_CLOCKEVENTS
CONFIG_HAVE_GCC_PLUGINS
CONFIG_TTY
CONFIG_ARCH_EPHEMERAL_INODES
CONFIG_ARCH_HAS_STRNCPY_FROM_USER
CONFIG_ARCH_HAS_STRNLEN_USER
CONFIG_HAVE_ASM_MODVERSIONS
CONFIG_HAVE_DEBUG_BUGVERBOSE
CONFIG_NO_DMA
CONFIG_SET_FS
CONFIG_TRACE_IRQFLAGS_SUPPORT
CONFIG_HAVE_ARCH_VMAP_STACK