3 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 90e11e6a37ab..7aec5ee9cfdf 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -90,11 +90,15 @@ extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
 
 extern unsigned long transparent_hugepage_flags;
 
+extern void prep_transhuge_page(struct page *page);
+extern void free_transhuge_page(struct page *page);
+
 int split_huge_page_to_list(struct page *page, struct list_head *list);
 static inline int split_huge_page(struct page *page)
 {
 	return split_huge_page_to_list(page, NULL);
 }
+void deferred_split_huge_page(struct page *page);
 
 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 		unsigned long address);
@@ -170,6 +174,7 @@ static inline int split_huge_page(struct page *page)
 {
 	return 0;
 }
+static inline void deferred_split_huge_page(struct page *page) {}
 #define split_huge_pmd(__vma, __pmd, __address)	\
 	do { } while (0)
 static inline int hugepage_madvise(struct vm_area_struct *vma,
diff --git a/include/linux/mm.h b/include/linux/mm.h
index e4397f640e86..aa8ae8330a75 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -508,6 +508,9 @@ enum compound_dtor_id {
 #ifdef CONFIG_HUGETLB_PAGE
 	HUGETLB_PAGE_DTOR,
 #endif
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+	TRANSHUGE_PAGE_DTOR,
+#endif
 	NR_COMPOUND_DTORS,
 };
 extern compound_page_dtor * const compound_page_dtors[];
@@ -537,6 +540,8 @@ static inline void set_compound_order(struct page *page, unsigned int order)
 	page[1].compound_order = order;
 }
 
+void free_compound_page(struct page *page);
+
 #ifdef CONFIG_MMU
 /*
  * Do pte_mkwrite, but only if the vma says VM_WRITE.  We do this when
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 809defe0597d..2dd9c313a8c0 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -55,6 +55,7 @@ struct page {
 						 */
 		void *s_mem;			/* slab first object */
 		atomic_t compound_mapcount;	/* first tail page */
+		/* page_deferred_list().next	 -- second tail page */
 	};
 
 	/* Second double word */
@@ -62,6 +63,7 @@ struct page {
 		union {
 			pgoff_t index;		/* Our offset within mapping. */
 			void *freelist;		/* sl[aou]b first free object */
+			/* page_deferred_list().prev	-- second tail page */
 		};
 
 		union {