2 files changed, 25 insertions, 5 deletions

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index b725839dfe71..884d6f6af05b 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -99,7 +99,8 @@ void lruvec_add_folio(struct lruvec *lruvec, struct folio *folio)
 
 	update_lru_size(lruvec, lru, folio_zonenum(folio),
 			folio_nr_pages(folio));
-	list_add(&folio->lru, &lruvec->lists[lru]);
+	if (lru != LRU_UNEVICTABLE)
+		list_add(&folio->lru, &lruvec->lists[lru]);
 }
 
 static __always_inline void add_page_to_lru_list(struct page *page,
@@ -115,6 +116,7 @@ void lruvec_add_folio_tail(struct lruvec *lruvec, struct folio *folio)
 
 	update_lru_size(lruvec, lru, folio_zonenum(folio),
 			folio_nr_pages(folio));
+	/* This is not expected to be used on LRU_UNEVICTABLE */
 	list_add_tail(&folio->lru, &lruvec->lists[lru]);
 }
 
@@ -127,8 +129,11 @@ static __always_inline void add_page_to_lru_list_tail(struct page *page,
 static __always_inline
 void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio)
 {
-	list_del(&folio->lru);
-	update_lru_size(lruvec, folio_lru_list(folio), folio_zonenum(folio),
+	enum lru_list lru = folio_lru_list(folio);
+
+	if (lru != LRU_UNEVICTABLE)
+		list_del(&folio->lru);
+	update_lru_size(lruvec, lru, folio_zonenum(folio),
 			-folio_nr_pages(folio));
 }
 
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 5140e5feb486..475bdb282769 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -85,7 +85,16 @@ struct page {
 			 * lruvec->lru_lock.  Sometimes used as a generic list
 			 * by the page owner.
 			 */
-			struct list_head lru;
+			union {
+				struct list_head lru;
+				/* Or, for the Unevictable "LRU list" slot */
+				struct {
+					/* Always even, to negate PageTail */
+					void *__filler;
+					/* Count page's or folio's mlocks */
+					unsigned int mlock_count;
+				};
+			};
 			/* See page-flags.h for PAGE_MAPPING_FLAGS */
 			struct address_space *mapping;
 			pgoff_t index;		/* Our offset within mapping. */
@@ -241,7 +250,13 @@ struct folio {
 		struct {
 	/* public: */
 			unsigned long flags;
-			struct list_head lru;
+			union {
+				struct list_head lru;
+				struct {
+					void *__filler;
+					unsigned int mlock_count;
+				};
+			};
 			struct address_space *mapping;
 			pgoff_t index;
 			void *private;