MAX_PHYSADDR_BITS   20 include/asm-x86/sparsemem.h #  define MAX_PHYSADDR_BITS	36
MAX_PHYSADDR_BITS   24 include/asm-x86/sparsemem.h #  define MAX_PHYSADDR_BITS	32
MAX_PHYSADDR_BITS   29 include/asm-x86/sparsemem.h # define MAX_PHYSADDR_BITS	44