ib_umem_find_best_pgoff
page_sz = ib_umem_find_best_pgoff(umem, dev->adapter_caps.page_size_cap, 0);
page_size = ib_umem_find_best_pgoff(umem, pgsz_bitmap, U64_MAX);
page_size = ib_umem_find_best_pgoff(umem, pgsz_bitmap, pgoff_bitmask);
return !!ib_umem_find_best_pgoff(umem, pgsz, U64_MAX);