mm: remove FGP_ENTRY

FGP_ENTRY is unused now, so remove it.

Link: https://lkml.kernel.org/r/20230307143410.28031-7-hch@lst.deSigned-off-by: Christoph Hellwig <hch@lst.de>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/pagemap.h

@@ -504,8 +504,7 @@ pgoff_t page_cache_prev_miss(struct address_space *mapping,
 #define FGP_NOFS		0x00000010
 #define FGP_NOWAIT		0x00000020
 #define FGP_FOR_MMAP		0x00000040
-#define FGP_ENTRY		0x00000080
-#define FGP_STABLE		0x00000100
+#define FGP_STABLE		0x00000080
 
 void *filemap_get_entry(struct address_space *mapping, pgoff_t index);
 struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index,

mm/filemap.c

@@ -1891,8 +1891,6 @@ void *filemap_get_entry(struct address_space *mapping, pgoff_t index)
  *
  * * %FGP_ACCESSED - The folio will be marked accessed.
  * * %FGP_LOCK - The folio is returned locked.
- * * %FGP_ENTRY - If there is a shadow / swap / DAX entry, return it
- *   instead of allocating a new folio to replace it.
  * * %FGP_CREAT - If no page is present then a new page is allocated using
  *   @gfp and added to the page cache and the VM's LRU list.
  *   The page is returned locked and with an increased refcount.
@@ -1918,11 +1916,8 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index,
 
 repeat:
 	folio = filemap_get_entry(mapping, index);
-	if (xa_is_value(folio)) {
-		if (fgp_flags & FGP_ENTRY)
-			return folio;
+	if (xa_is_value(folio))
 		folio = NULL;
-	}
 	if (!folio)
 		goto no_page;
 

mm/folio-compat.c

@@ -97,8 +97,8 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index,
 	struct folio *folio;
 
 	folio = __filemap_get_folio(mapping, index, fgp_flags, gfp);
-	if (!folio || xa_is_value(folio))
-		return &folio->page;
+	if (!folio)
+		return NULL;
 	return folio_file_page(folio, index);
 }
 EXPORT_SYMBOL(pagecache_get_page);