diff --git a/include/linux/mm.h b/include/linux/mm.h
index c7470da5797f..78e583b50e42 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1261,12 +1261,22 @@ static inline int folio_large_mapcount(const struct folio *folio)
  * references the entire folio counts exactly once, even when such special
  * page table entries are comprised of multiple ordinary page table entries.
  *
+ * Will report 0 for pages which cannot be mapped into userspace, such as
+ * slab, page tables and similar.
+ *
  * Return: The number of times this folio is mapped.
  */
 static inline int folio_mapcount(const struct folio *folio)
 {
-	if (likely(!folio_test_large(folio)))
-		return atomic_read(&folio->_mapcount) + 1;
+	int mapcount;
+
+	if (likely(!folio_test_large(folio))) {
+		mapcount = atomic_read(&folio->_mapcount) + 1;
+		/* Handle page_has_type() pages */
+		if (mapcount < PAGE_MAPCOUNT_RESERVE + 1)
+			mapcount = 0;
+		return mapcount;
+	}
 	return folio_large_mapcount(folio);
 }