[PATCH] mm: Remove mlock_count from struct page

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

All users now use folio->mlock_count so we can remove this element of
struct page.  Move the useful comments over to struct folio.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/mm_types.h | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index d934a3a5b443..34205313a839 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -94,14 +94,6 @@ struct page {
 			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;
-				};
-
 				/* Or, free page */
 				struct list_head buddy_list;
 				struct list_head pcp_list;
@@ -391,7 +383,9 @@ struct folio {
 			union {
 				struct list_head lru;
 	/* private: avoid cluttering the output */
+				/* For the Unevictable "LRU list" slot */
 				struct {
+					/* Avoid compound_head */
 					void *__filler;
 	/* public: */
 					unsigned int mlock_count;
-- 
2.47.2