#ifdef CONFIG_SPARSEMEM/* * SECTION_SIZE_BITS 2^N: how big each section will be * MAX_PHYSADDR_BITS 2^N: how much physical address space we have * MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space */#define SECTION_SIZE_BITS 24#define MAX_PHYSADDR_BITS 38#define MAX_PHYSMEM_BITS 36