[PATCH v2 8/9] mm/page_io: convert count_swpout_vm_event() to take in a folio

[Peng Zhang <zhangpeng362@xxxxxxxxxx>]

From: ZhangPeng <zhangpeng362@xxxxxxxxxx>

Convert count_swpout_vm_event() to take in a folio. We can remove five
implicit calls to compound_head() by taking in a folio.

Signed-off-by: ZhangPeng <zhangpeng362@xxxxxxxxxx>
---
 mm/page_io.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index e28395331bb0..fa8caf1c05d8 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -205,13 +205,13 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
 	return 0;
 }
 
-static inline void count_swpout_vm_event(struct page *page)
+static inline void count_swpout_vm_event(struct folio *folio)
 {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	if (unlikely(PageTransHuge(page)))
+	if (unlikely(folio_test_pmd_mappable(folio)))
 		count_vm_event(THP_SWPOUT);
 #endif
-	count_vm_events(PSWPOUT, thp_nr_pages(page));
+	count_vm_events(PSWPOUT, folio_nr_pages(folio));
 }
 
 #if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
@@ -280,7 +280,7 @@ static void sio_write_complete(struct kiocb *iocb, long ret)
 		}
 	} else {
 		for (p = 0; p < sio->pages; p++)
-			count_swpout_vm_event(sio->bvec[p].bv_page);
+			count_swpout_vm_event(page_folio(sio->bvec[p].bv_page));
 	}
 
 	for (p = 0; p < sio->pages; p++)
@@ -339,7 +339,7 @@ static void swap_writepage_bdev_sync(struct page *page,
 	__bio_add_page(&bio, page, thp_size(page), 0);
 
 	bio_associate_blkg_from_page(&bio, page);
-	count_swpout_vm_event(page);
+	count_swpout_vm_event(folio);
 
 	folio_start_writeback(folio);
 	folio_unlock(folio);
@@ -362,7 +362,7 @@ static void swap_writepage_bdev_async(struct page *page,
 	__bio_add_page(bio, page, thp_size(page), 0);
 
 	bio_associate_blkg_from_page(bio, page);
-	count_swpout_vm_event(page);
+	count_swpout_vm_event(folio);
 	folio_start_writeback(folio);
 	folio_unlock(folio);
 	submit_bio(bio);
-- 
2.25.1