Subject says it all. Introduces include/asm-i386/mach-*/mach_seg.h, and
depends on processor.h merge patch in that it further modifies
include/asm-i386/mach-xen/mach_mode.h.
depends on processor.h merge patch in that it further modifies
include/asm-i386/mach-xen/mach_mode.h.