NODE_DATA(0) = pfn_to_kaddr(free_pfn);
memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
free_pfn += PFN_UP(sizeof(struct pglist_data));
NODE_DATA(0) = pfn_to_kaddr(free_pfn);
memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
free_pfn += PFN_UP(sizeof(struct pglist_data));