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