CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES (not configurable)

configname: CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES

Linux Kernel Configuration
└─>General architecture-dependent options
└─>HAVE_ARCH_COMPAT_MMAP_BASES
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This allows 64bit applications to invoke 32-bit mmap() syscall
and vice-versa 32-bit applications to call 64-bit mmap().
Required for applications doing different bitness syscalls.