[PATCH RFC 11/14] treewide: remove folio_set/clear_private()

[Zi Yan]

They are no-ops now. Remove them.

Assisted-by: Claude:claude-opus-4-8
Assisted-by: Codex:gpt-5
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
To: Trond Myklebust <trondmy@xxxxxxxxxx>
To: Anna Schumaker <anna@xxxxxxxxxx>
To: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
To: Jan Kara <jack@xxxxxxx>
To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
To: David Hildenbrand <david@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
Cc: Joshua Hahn <joshua.hahnjy@xxxxxxxxx>
Cc: Rakie Kim <rakie.kim@xxxxxx>
Cc: Byungchul Park <byungchul@xxxxxx>
Cc: Gregory Price <gourry@xxxxxxxxxx>
Cc: Ying Huang <ying.huang@xxxxxxxxxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: linux-nfs@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
---
 fs/nfs/write.c          | 2 --
 include/linux/pagemap.h | 4 +---
 mm/migrate.c            | 1 -
 3 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index d2b03ceaeb4f1..d7e50ecb4edc3 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -717,7 +717,6 @@ static void nfs_inode_add_request(struct nfs_page *req)
 	nfs_lock_request(req);
 	spin_lock(&mapping->i_private_lock);
 	set_bit(PG_MAPPED, &req->wb_flags);
-	folio_set_private(folio);
 	folio->private = req;
 	spin_unlock(&mapping->i_private_lock);
 	atomic_long_inc(&nfsi->nrequests);
@@ -744,7 +743,6 @@ static void nfs_inode_remove_request(struct nfs_page *req)
 		spin_lock(&mapping->i_private_lock);
 		if (likely(folio)) {
 			folio->private = NULL;
-			folio_clear_private(folio);
 			clear_bit(PG_MAPPED, &req->wb_head->wb_flags);
 		}
 		spin_unlock(&mapping->i_private_lock);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 90904a4d173b7..5ca5aa365f319 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -594,7 +594,6 @@ static inline void folio_attach_private(struct folio *folio, void *data)
 {
 	folio_get(folio);
 	folio->private = data;
-	folio_set_private(folio);
 }
 
 /**
@@ -629,9 +628,8 @@ static inline void *folio_detach_private(struct folio *folio)
 {
 	void *data = folio_get_private(folio);
 
-	if (!folio_test_private(folio))
+	if (!data)
 		return NULL;
-	folio_clear_private(folio);
 	folio->private = NULL;
 	folio_put(folio);
 
diff --git a/mm/migrate.c b/mm/migrate.c
index 014fcb745d210..1d84766f12a18 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -838,7 +838,6 @@ void folio_migrate_flags(struct folio *newfolio, struct folio *folio)
 	 */
 	if (folio_test_swapcache(folio))
 		folio_clear_swapcache(folio);
-	folio_clear_private(folio);
 
 	/* page->private contains hugetlb specific flags */
 	if (!folio_test_hugetlb(folio))

-- 
2.53.0