|  | mainmenu "User Mode Linux/$SUBARCH $KERNELVERSION Kernel Configuration" | 
|  |  | 
|  | source "arch/um/Kconfig.common" | 
|  |  | 
|  | menu "UML-specific options" | 
|  |  | 
|  | menu "Host processor type and features" | 
|  |  | 
|  | source "arch/x86/Kconfig.cpu" | 
|  |  | 
|  | endmenu | 
|  |  | 
|  | config UML_X86 | 
|  | def_bool y | 
|  | select GENERIC_FIND_FIRST_BIT | 
|  |  | 
|  | config 64BIT | 
|  | bool "64-bit kernel" if SUBARCH = "x86" | 
|  | default SUBARCH != "i386" | 
|  |  | 
|  | config X86_32 | 
|  | def_bool !64BIT | 
|  | select HAVE_AOUT | 
|  | select ARCH_WANT_IPC_PARSE_VERSION | 
|  | select MODULES_USE_ELF_REL | 
|  | select CLONE_BACKWARDS | 
|  | select OLD_SIGSUSPEND3 | 
|  | select OLD_SIGACTION | 
|  |  | 
|  | config X86_64 | 
|  | def_bool 64BIT | 
|  | select MODULES_USE_ELF_RELA | 
|  |  | 
|  | config ARCH_DEFCONFIG | 
|  | string | 
|  | default "arch/um/configs/i386_defconfig" if X86_32 | 
|  | default "arch/um/configs/x86_64_defconfig" if X86_64 | 
|  |  | 
|  | config RWSEM_XCHGADD_ALGORITHM | 
|  | def_bool 64BIT | 
|  |  | 
|  | config RWSEM_GENERIC_SPINLOCK | 
|  | def_bool !RWSEM_XCHGADD_ALGORITHM | 
|  |  | 
|  | config 3_LEVEL_PGTABLES | 
|  | bool "Three-level pagetables" if !64BIT | 
|  | default 64BIT | 
|  | help | 
|  | Three-level pagetables will let UML have more than 4G of physical | 
|  | memory.  All the memory that can't be mapped directly will be treated | 
|  | as high memory. | 
|  |  | 
|  | However, this it experimental on 32-bit architectures, so if unsure say | 
|  | N (on x86-64 it's automatically enabled, instead, as it's safe there). | 
|  |  | 
|  | config ARCH_HAS_SC_SIGNALS | 
|  | def_bool !64BIT | 
|  |  | 
|  | config ARCH_REUSE_HOST_VSYSCALL_AREA | 
|  | def_bool !64BIT | 
|  |  | 
|  | config GENERIC_HWEIGHT | 
|  | def_bool y | 
|  |  | 
|  | source "arch/um/Kconfig.um" | 
|  |  | 
|  | endmenu | 
|  |  | 
|  | source "arch/um/Kconfig.rest" |