diff --git a/mm/page_io.c b/mm/page_io.c
index e4fa7ffffe8b..c984a4023a65 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -358,7 +358,16 @@ static void swap_add_folio(struct swap_io_ctx *ctx, struct folio *folio, int rw)
 	}
 	bvec_set_folio(&sio->bvecs[sio->nr_bvecs], folio, folio_size(folio), 0);
 	sio->len += folio_size(folio);
-	if (++sio->nr_bvecs == ARRAY_SIZE(sio->bvecs)) {
+
+	/*
+	 * Write out the iocb if we filled it, or if the device is synchronous.
+	 *
+	 * The latter is to work around expectations in the classic LRU code
+	 * which make synchronous clearing of the folio writeback flag in the
+	 * reclaim path beneficial.
+	 */
+	if (++sio->nr_bvecs == ARRAY_SIZE(sio->bvecs) ||
+	    (rw == WRITE && (sis->flags & SWP_SYNCHRONOUS_IO))) {
 		if (rw == WRITE)
 			swap_write_submit(ctx);
 		else