From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Wed, 3 Sep 2025 19:10:39 +0000 (+0100)
Subject: mm: remove mlock_count from struct page
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=135c92d4b62abdf3d60496686dbacdd174d68fb6;p=users%2Fjedix%2Flinux-maple.git

mm: remove mlock_count from struct page

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

Link: https://lkml.kernel.org/r/20250903191041.1630338-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 275e8060d9182..ff2b4e13215f4 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;