diff --git a/fs/dax.c b/fs/dax.c
index 1fbba0d21c13..dbb58692efec 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -2200,6 +2200,7 @@ static int dax_range_compare_iter(struct iomap_iter *it_src,
 	const struct iomap *dmap = &it_dest->iomap;
 	loff_t pos1 = it_src->pos, pos2 = it_dest->pos;
 	void *saddr, *daddr;
+	size_t size1, size2;
 	int id, ret;
 
 	len = min(len, min(smap->length, dmap->length));
@@ -2215,17 +2216,18 @@ static int dax_range_compare_iter(struct iomap_iter *it_src,
 	}
 
 	id = dax_read_lock();
-	ret = dax_iomap_direct_access(smap, pos1, ALIGN(pos1 + len, PAGE_SIZE),
-				      &saddr, NULL);
+	size1 = ALIGN(len + offset_in_page(pos1), PAGE_SIZE);
+	ret = dax_iomap_direct_access(smap, pos1, size1, &saddr, NULL);
 	if (ret < 0)
 		goto out_unlock;
 
-	ret = dax_iomap_direct_access(dmap, pos2, ALIGN(pos2 + len, PAGE_SIZE),
-				      &daddr, NULL);
+	size2 = ALIGN(len + offset_in_page(pos2), PAGE_SIZE);
+	ret = dax_iomap_direct_access(dmap, pos2, size2, &daddr, NULL);
 	if (ret < 0)
 		goto out_unlock;
 
-	*same = !memcmp(saddr, daddr, len);
+	*same = !memcmp(saddr + offset_in_page(pos1),
+			daddr + offset_in_page(pos2), len);
 	if (!*same)
 		len = 0;
 	dax_read_unlock(id);