[PATCH v9 17/96] mm: Add folio_young() and folio_idle()

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

Idle page tracking is handled through page_ext for 32-bit.  Add folio
equivalents for 32 bit and move all the page compatibility parts to
common code.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/page_idle.h | 99 +++++++++++++++++++--------------------
 1 file changed, 49 insertions(+), 50 deletions(-)

diff --git a/include/linux/page_idle.h b/include/linux/page_idle.h
index 1e894d34bdce..bd957e818558 100644
--- a/include/linux/page_idle.h
+++ b/include/linux/page_idle.h
@@ -8,46 +8,16 @@
 
 #ifdef CONFIG_IDLE_PAGE_TRACKING
 
-#ifdef CONFIG_64BIT
-static inline bool page_is_young(struct page *page)
-{
-	return PageYoung(page);
-}
-
-static inline void set_page_young(struct page *page)
-{
-	SetPageYoung(page);
-}
-
-static inline bool test_and_clear_page_young(struct page *page)
-{
-	return TestClearPageYoung(page);
-}
-
-static inline bool page_is_idle(struct page *page)
-{
-	return PageIdle(page);
-}
-
-static inline void set_page_idle(struct page *page)
-{
-	SetPageIdle(page);
-}
-
-static inline void clear_page_idle(struct page *page)
-{
-	ClearPageIdle(page);
-}
-#else /* !CONFIG_64BIT */
+#ifndef CONFIG_64BIT
 /*
  * If there is not enough space to store Idle and Young bits in page flags, use
  * page ext flags instead.
  */
 extern struct page_ext_operations page_idle_ops;
 
-static inline bool page_is_young(struct page *page)
+static inline bool folio_young(struct folio *folio)
 {
-	struct page_ext *page_ext = lookup_page_ext(page);
+	struct page_ext *page_ext = lookup_page_ext(&folio->page);
 
 	if (unlikely(!page_ext))
 		return false;
@@ -55,9 +25,9 @@ static inline bool page_is_young(struct page *page)
 	return test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
 }
 
-static inline void set_page_young(struct page *page)
+static inline void folio_set_young_flag(struct folio *folio)
 {
-	struct page_ext *page_ext = lookup_page_ext(page);
+	struct page_ext *page_ext = lookup_page_ext(&folio->page);
 
 	if (unlikely(!page_ext))
 		return;
@@ -65,9 +35,9 @@ static inline void set_page_young(struct page *page)
 	set_bit(PAGE_EXT_YOUNG, &page_ext->flags);
 }
 
-static inline bool test_and_clear_page_young(struct page *page)
+static inline bool folio_test_clear_young_flag(struct folio *folio)
 {
-	struct page_ext *page_ext = lookup_page_ext(page);
+	struct page_ext *page_ext = lookup_page_ext(&folio->page);
 
 	if (unlikely(!page_ext))
 		return false;
@@ -75,9 +45,9 @@ static inline bool test_and_clear_page_young(struct page *page)
 	return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);
 }
 
-static inline bool page_is_idle(struct page *page)
+static inline bool folio_idle(struct folio *folio)
 {
-	struct page_ext *page_ext = lookup_page_ext(page);
+	struct page_ext *page_ext = lookup_page_ext(&folio->page);
 
 	if (unlikely(!page_ext))
 		return false;
@@ -85,9 +55,9 @@ static inline bool page_is_idle(struct page *page)
 	return test_bit(PAGE_EXT_IDLE, &page_ext->flags);
 }
 
-static inline void set_page_idle(struct page *page)
+static inline void folio_set_idle_flag(struct folio *folio)
 {
-	struct page_ext *page_ext = lookup_page_ext(page);
+	struct page_ext *page_ext = lookup_page_ext(&folio->page);
 
 	if (unlikely(!page_ext))
 		return;
@@ -95,46 +65,75 @@ static inline void set_page_idle(struct page *page)
 	set_bit(PAGE_EXT_IDLE, &page_ext->flags);
 }
 
-static inline void clear_page_idle(struct page *page)
+static inline void folio_clear_idle_flag(struct folio *folio)
 {
-	struct page_ext *page_ext = lookup_page_ext(page);
+	struct page_ext *page_ext = lookup_page_ext(&folio->page);
 
 	if (unlikely(!page_ext))
 		return;
 
 	clear_bit(PAGE_EXT_IDLE, &page_ext->flags);
 }
-#endif /* CONFIG_64BIT */
+#endif /* !CONFIG_64BIT */
 
 #else /* !CONFIG_IDLE_PAGE_TRACKING */
 
-static inline bool page_is_young(struct page *page)
+static inline bool folio_young(struct folio *folio)
 {
 	return false;
 }
 
-static inline void set_page_young(struct page *page)
+static inline void folio_set_young_flag(struct folio *folio)
 {
 }
 
-static inline bool test_and_clear_page_young(struct page *page)
+static inline bool folio_test_clear_young_flag(struct folio *folio)
 {
 	return false;
 }
 
-static inline bool page_is_idle(struct page *page)
+static inline bool folio_idle(struct folio *folio)
 {
 	return false;
 }
 
-static inline void set_page_idle(struct page *page)
+static inline void folio_set_idle_flag(struct folio *folio)
 {
 }
 
-static inline void clear_page_idle(struct page *page)
+static inline void folio_clear_idle_flag(struct folio *folio)
 {
 }
 
 #endif /* CONFIG_IDLE_PAGE_TRACKING */
 
+static inline bool page_is_young(struct page *page)
+{
+	return folio_young(page_folio(page));
+}
+
+static inline void set_page_young(struct page *page)
+{
+	folio_set_young_flag(page_folio(page));
+}
+
+static inline bool test_and_clear_page_young(struct page *page)
+{
+	return folio_test_clear_young_flag(page_folio(page));
+}
+
+static inline bool page_is_idle(struct page *page)
+{
+	return folio_idle(page_folio(page));
+}
+
+static inline void set_page_idle(struct page *page)
+{
+	folio_set_idle_flag(page_folio(page));
+}
+
+static inline void clear_page_idle(struct page *page)
+{
+	folio_clear_idle_flag(page_folio(page));
+}
 #endif /* _LINUX_MM_PAGE_IDLE_H */
-- 
2.30.2