CONFIG_HAVE_MBAR is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

CONFIG_HAVE_MBAR (not configurable)

configname: CONFIG_HAVE_MBAR

Linux Kernel Configuration
└─>HAVE_MBAR
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
is depended by
CONFIG_M547x
CONFIG_M548x