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can_split_folio() is just a refcount comparison, making sure only the split caller holds an extra pin. Open code it with folio_expected_ref_count() != folio_ref_count() - 1. For the extra_pins used by folio_ref_freeze(), add folio_cache_ref_count() to calculate it. Also replace folio_expected_ref_count() with folio_cache_ref_count() used by folio_ref_unfreeze(), since they are returning the same values when a folio is frozen and folio_cache_ref_count() does not have unnecessary folio_mapcount() in its implementation. Link: https://lkml.kernel.org/r/20251126210618.1971206-3-ziy@nvidia.com Signed-off-by: Zi Yan <ziy@nvidia.com> Suggested-by: David Hildenbrand (Red Hat) <david@kernel.org> Reviewed-by: Wei Yang <richard.weiyang@gmail.com> Acked-by: David Hildenbrand (Red Hat) <david@kernel.org> Cc: Balbir Singh <balbirs@nvidia.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Barry Song <baohua@kernel.org> Cc: Dev Jain <dev.jain@arm.com> Cc: Lance Yang <lance.yang@linux.dev> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Naoya Horiguchi <nao.horiguchi@gmail.com> Cc: Nico Pache <npache@redhat.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>