[PATCH 01/18] mm: add mm_counter_folio() and mm_counter_file_folio()

[Kefeng Wang]

Introduce two mm counter folio functions mm_counter_folio() and
mm_counter_file_folio(), will be used folio conversion, and it
saves a compound_head() in mm_counter().

Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
---
 include/linux/mm.h | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index caf13e94260e..f5f76504b212 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2583,19 +2583,29 @@ static inline void dec_mm_counter(struct mm_struct *mm, int member)
 	mm_trace_rss_stat(mm, member);
 }
 
-/* Optimized variant when page is already known not to be PageAnon */
-static inline int mm_counter_file(struct page *page)
+static inline int mm_counter_file_folio(struct folio *folio)
 {
-	if (PageSwapBacked(page))
+	if (folio_test_swapbacked(folio))
 		return MM_SHMEMPAGES;
 	return MM_FILEPAGES;
 }
 
-static inline int mm_counter(struct page *page)
+/* Optimized variant when page is already known not to be PageAnon */
+static inline int mm_counter_file(struct page *page)
+{
+	return mm_counter_file_folio(page_folio(page));
+}
+
+static inline int mm_counter_folio(struct folio *folio)
 {
-	if (PageAnon(page))
+	if (folio_test_anon(folio))
 		return MM_ANONPAGES;
-	return mm_counter_file(page);
+	return mm_counter_file_folio(folio);
+}
+
+static inline int mm_counter(struct page *page)
+{
+	return mm_counter_folio(page_folio(page));
 }
 
 static inline unsigned long get_mm_rss(struct mm_struct *mm)
-- 
2.27.0