mm:page-writeback: use folio_next_index() helper in writeback_iter()

Simplify code pattern of 'folio->index + folio_nr_pages(folio)' by using
the existing helper folio_next_index().

Link: https://lkml.kernel.org/r/20240821063112.4053157-1-liyuesong@vivo.com
Signed-off-by: Yuesong Li <liyuesong@vivo.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 4430ac68e4c4144907e7c7d10ff6728f7711f6ca..f5448311c89eb8aec778da56afc7566465e2f468 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2612,7 +2612,7 @@ struct folio *writeback_iter(struct address_space *mapping,
 
 done:
        if (wbc->range_cyclic)
-               mapping->writeback_index = folio->index + folio_nr_pages(folio);
+               mapping->writeback_index = folio_next_index(folio);
        folio_batch_release(&wbc->fbatch);
        return NULL;
 }