pgmap_vmemmap_nr
unsigned long nr_pages = pgmap_vmemmap_nr(pgmap);
nr_pages = pgmap_vmemmap_nr(pgmap);
return pgmap_vmemmap_nr(pgmap);
unsigned int pfns_per_compound = pgmap_vmemmap_nr(pgmap);
unsigned long nr_pages = pgmap_vmemmap_nr(pgmap);
size = min(end - start, pgmap_vmemmap_nr(pgmap) * sizeof(struct page));