mm: convert put_devmap_managed_page_refs() to put_devmap_managed_folio_refs()

All callers have a folio so we can remove this use of
page_ref_sub_return().

Link: https://lkml.kernel.org/r/20240424191914.361554-4-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/mm.h

@@ -1441,17 +1441,17 @@ vm_fault_t finish_fault(struct vm_fault *vmf);
 #if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_FS_DAX)
 DECLARE_STATIC_KEY_FALSE(devmap_managed_key);
 
-bool __put_devmap_managed_page_refs(struct page *page, int refs);
-static inline bool put_devmap_managed_page_refs(struct page *page, int refs)
+bool __put_devmap_managed_folio_refs(struct folio *folio, int refs);
+static inline bool put_devmap_managed_folio_refs(struct folio *folio, int refs)
 {
 	if (!static_branch_unlikely(&devmap_managed_key))
 		return false;
-	if (!is_zone_device_page(page))
+	if (!folio_is_zone_device(folio))
 		return false;
-	return __put_devmap_managed_page_refs(page, refs);
+	return __put_devmap_managed_folio_refs(folio, refs);
 }
 #else /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */
-static inline bool put_devmap_managed_page_refs(struct page *page, int refs)
+static inline bool put_devmap_managed_folio_refs(struct folio *folio, int refs)
 {
 	return false;
 }
@@ -1575,7 +1575,7 @@ static inline void put_page(struct page *page)
 	 * For some devmap managed pages we need to catch refcount transition
 	 * from 2 to 1:
 	 */
-	if (put_devmap_managed_page_refs(&folio->page, 1))
+	if (put_devmap_managed_folio_refs(folio, 1))
 		return;
 	folio_put(folio);
 }

mm/gup.c

@@ -89,7 +89,7 @@ static inline struct folio *try_get_folio(struct page *page, int refs)
 	 * belongs to this folio.
 	 */
 	if (unlikely(page_folio(page) != folio)) {
-		if (!put_devmap_managed_page_refs(&folio->page, refs))
+		if (!put_devmap_managed_folio_refs(folio, refs))
 			folio_put_refs(folio, refs);
 		goto retry;
 	}
@@ -156,7 +156,7 @@ struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags)
 	 */
 	if (unlikely((flags & FOLL_LONGTERM) &&
 		     !folio_is_longterm_pinnable(folio))) {
-		if (!put_devmap_managed_page_refs(&folio->page, refs))
+		if (!put_devmap_managed_folio_refs(folio, refs))
 			folio_put_refs(folio, refs);
 		return NULL;
 	}
@@ -198,7 +198,7 @@ static void gup_put_folio(struct folio *folio, int refs, unsigned int flags)
 			refs *= GUP_PIN_COUNTING_BIAS;
 	}
 
-	if (!put_devmap_managed_page_refs(&folio->page, refs))
+	if (!put_devmap_managed_folio_refs(folio, refs))
 		folio_put_refs(folio, refs);
 }
 

mm/memremap.c

@@ -512,9 +512,9 @@ void zone_device_page_init(struct page *page)
 EXPORT_SYMBOL_GPL(zone_device_page_init);
 
 #ifdef CONFIG_FS_DAX
-bool __put_devmap_managed_page_refs(struct page *page, int refs)
+bool __put_devmap_managed_folio_refs(struct folio *folio, int refs)
 {
-	if (page->pgmap->type != MEMORY_DEVICE_FS_DAX)
+	if (folio->page.pgmap->type != MEMORY_DEVICE_FS_DAX)
 		return false;
 
 	/*
@@ -522,9 +522,9 @@ bool __put_devmap_managed_page_refs(struct page *page, int refs)
 	 * refcount is 1, then the page is free and the refcount is
 	 * stable because nobody holds a reference on the page.
 	 */
-	if (page_ref_sub_return(page, refs) == 1)
-		wake_up_var(&page->_refcount);
+	if (folio_ref_sub_return(folio, refs) == 1)
+		wake_up_var(&folio->_refcount);
 	return true;
 }
-EXPORT_SYMBOL(__put_devmap_managed_page_refs);
+EXPORT_SYMBOL(__put_devmap_managed_folio_refs);
 #endif /* CONFIG_FS_DAX */

mm/swap.c

@@ -980,7 +980,7 @@ void folios_put_refs(struct folio_batch *folios, unsigned int *refs)
 				unlock_page_lruvec_irqrestore(lruvec, flags);
 				lruvec = NULL;
 			}
-			if (put_devmap_managed_page_refs(&folio->page, nr_refs))
+			if (put_devmap_managed_folio_refs(folio, nr_refs))
 				continue;
 			if (folio_ref_sub_and_test(folio, nr_refs))
 				free_zone_device_folio(folio);