diff --git a/include/linux/mm.h b/include/linux/mm.h
index f83a1c9ec8e4..104ec00823da 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1727,6 +1727,25 @@ static inline size_t folio_size(struct folio *folio)
 	return PAGE_SIZE << folio_order(folio);
 }
 
+/**
+ * folio_estimated_sharers - Estimate the number of sharers of a folio.
+ * @folio: The folio.
+ *
+ * folio_estimated_sharers() aims to serve as a function to efficiently
+ * estimate the number of processes sharing a folio. This is done by
+ * looking at the precise mapcount of the first subpage in the folio, and
+ * assuming the other subpages are the same. This may not be true for large
+ * folios. If you want exact mapcounts for exact calculations, look at
+ * page_mapcount() or folio_total_mapcount().
+ *
+ * Return: The estimated number of processes sharing a folio.
+ */
+static inline int folio_estimated_sharers(struct folio *folio)
+{
+	return page_mapcount(folio_page(folio, 0));
+}
+
+
 #ifndef HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
 static inline int arch_make_page_accessible(struct page *page)
 {
diff --git a/mm/madvise.c b/mm/madvise.c
index d03e149ffe6e..5973399b2f9b 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -654,8 +654,8 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
 		 * deactivate all pages.
 		 */
 		if (folio_test_large(folio)) {
-			if (folio_mapcount(folio) != 1)
-				goto out;
+			if (folio_estimated_sharers(folio) != 1)
+				break;
 			folio_get(folio);
 			if (!folio_trylock(folio)) {
 				folio_put(folio);