arm linux内存初始化函数调用关系

　　arch/arm/setup.c : void __init setup_arch(char **cmdline_p)  -> paging_init(mdesc);

　　arch/arm/mm/mmu.c: void __init paging_init(struct machine_desc *mdesc)-> __init bootmem_init(void)

　　arch/arm/mm/init.c void __init bootmem_init(void)-> bootmem_init_node --> map_memory_bank---> create_mapping

　　arch/arm/mm/mmu.c void __init create_mapping(struct map_desc *md) ---> alloc_init_section -->alloc_init_pte