核心游记之　内存管理paging_init

start_kernel ()
         --> setup_arch ()
                   --> paging_init ()
                            --> bootmem_init ()
                            --> alloc_bootmem_low_pages ()
 
 
/*
* Initialise the bootmem allocator for all nodes.  This is called
* early during the architecture specific initialisation.
*/
bootmem_init ()
 
 
/*
* paging_init() sets up the page tables, initialises the zone memory
* maps, and sets up the zero page, bad page and bad page tables.
*/
paging_init ()