diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 467302056e1717ca11a18d2ea7fcecb1641e269f..9521cfdf18ca1340208bd5dcc41166d9fd3a3451 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -258,6 +258,19 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
 	else
 		return NULL;
 }
+
+/**
+ * thp_order - Order of a transparent huge page.
+ * @page: Head page of a transparent huge page.
+ */
+static inline unsigned int thp_order(struct page *page)
+{
+	VM_BUG_ON_PGFLAGS(PageTail(page), page);
+	if (PageHead(page))
+		return HPAGE_PMD_ORDER;
+	return 0;
+}
+
 static inline int hpage_nr_pages(struct page *page)
 {
 	if (unlikely(PageTransHuge(page)))
@@ -317,6 +330,12 @@ static inline struct list_head *page_deferred_list(struct page *page)
 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
 
+static inline unsigned int thp_order(struct page *page)
+{
+	VM_BUG_ON_PGFLAGS(PageTail(page), page);
+	return 0;
+}
+
 static inline int hpage_nr_pages(struct page *page)
 {
 	VM_BUG_ON_PAGE(PageTail(page), page);