mm/page_io: use a folio in swap_writepage_bdev_async()

Saves one implicit call to compound_head().

Link: https://lkml.kernel.org/r/20230721034451.16412-9-zhangpeng362@huawei.com
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page_io.c b/mm/page_io.c
index fc6e1a4..886addf 100644 (file)
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -352,6 +352,7 @@ static void swap_writepage_bdev_async(struct page *page,
                struct writeback_control *wbc, struct swap_info_struct *sis)
 {
        struct bio *bio;
+       struct folio *folio = page_folio(page);
 
        bio = bio_alloc(sis->bdev, 1,
                        REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc),
@@ -362,8 +363,8 @@ static void swap_writepage_bdev_async(struct page *page,
 
        bio_associate_blkg_from_page(bio, page);
        count_swpout_vm_event(page);
-       set_page_writeback(page);
-       unlock_page(page);
+       folio_start_writeback(folio);
+       folio_unlock(folio);
        submit_bio(bio);
 }