memfd_pin_folios
nr_folios = memfd_pin_folios(memfd, start, end, folios, pgcnt, &pgoff);
nfolios = memfd_pin_folios(user->file, start, end, user->ufolios,
long memfd_pin_folios(struct file *memfd, loff_t start, loff_t end,
EXPORT_SYMBOL_GPL(memfd_pin_folios);
nr_pinned = memfd_pin_folios(file, 0, size - 1, folios, max_folios,