diff --git a/mm/readahead.c b/mm/readahead.c
index 57557e2949870c8f4ff56c9347c4c17f7c624586..301b36c4a0ce10a006c651637cb2597040ec1413 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -83,10 +83,10 @@ static unsigned long get_init_ra_size(unsigned long size, unsigned long max)
 {
 	unsigned long newsize = roundup_pow_of_two(size);
 
-	if (newsize <= max / 64)
-		newsize = newsize * newsize;
+	if (newsize <= max / 32)
+		newsize = newsize * 4;
 	else if (newsize <= max / 4)
-		newsize = max / 4;
+		newsize = newsize * 2;
 	else
 		newsize = max;
 	return newsize;