diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 231651a..83c7465 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -628,9 +628,9 @@
  * On idle system, we can be called long after we scheduled because we use
  * deferred timers so count with missed periods.
  */
-static void writeout_period(unsigned long t)
+static void writeout_period(struct timer_list *t)
 {
-	struct wb_domain *dom = (void *)t;
+	struct wb_domain *dom = from_timer(dom, t, period_timer);
 	int miss_periods = (jiffies - dom->period_time) /
 						 VM_COMPLETIONS_PERIOD_LEN;
 
@@ -653,8 +653,7 @@
 
 	spin_lock_init(&dom->lock);
 
-	setup_deferrable_timer(&dom->period_timer, writeout_period,
-			       (unsigned long)dom);
+	timer_setup(&dom->period_timer, writeout_period, TIMER_DEFERRABLE);
 
 	dom->dirty_limit_tstamp = jiffies;