memmap_size       676 mm/sparse.c    	unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
memmap_size       678 mm/sparse.c    	page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
memmap_size       682 mm/sparse.c    	ret = vmalloc(memmap_size);