MAX_PHYSMEM_BITS   21 arch/x86/include/asm/sparsemem.h #  define MAX_PHYSMEM_BITS	36
MAX_PHYSMEM_BITS   25 arch/x86/include/asm/sparsemem.h #  define MAX_PHYSMEM_BITS	32
MAX_PHYSMEM_BITS   30 arch/x86/include/asm/sparsemem.h # define MAX_PHYSMEM_BITS	46