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