memmap_pages_add
void memmap_pages_add(long delta);
memmap_pages_add(-1);
memmap_pages_add(nr_pages);
memmap_pages_add(1);
memmap_pages_add(DIV_ROUND_UP(size, PAGE_SIZE));
memmap_pages_add(-1L * (DIV_ROUND_UP(table_size, PAGE_SIZE)));
memmap_pages_add(section_nr_vmemmap_pages(pfn, nr_pages, altmap, pgmap));
memmap_pages_add(-section_nr_vmemmap_pages(pfn, nr_pages, altmap, pgmap));