writeback: remove 'range_cyclic' argument for wb_start_writeback()

All the callers pass in 'true' for range_cyclic, so kill the
argument.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/fs-writeback.c

@@ -934,7 +934,7 @@ static void bdi_split_work_to_wbs(struct backing_dev_info *bdi,
 #endif	/* CONFIG_CGROUP_WRITEBACK */
 
 void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
-			bool range_cyclic, enum wb_reason reason)
+			enum wb_reason reason)
 {
 	struct wb_writeback_work *work;
 
@@ -955,7 +955,7 @@ void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
 
 	work->sync_mode	= WB_SYNC_NONE;
 	work->nr_pages	= nr_pages;
-	work->range_cyclic = range_cyclic;
+	work->range_cyclic = 1;
 	work->reason	= reason;
 	work->auto_free	= 1;
 
@@ -1971,7 +1971,7 @@ void wakeup_flusher_threads(enum wb_reason reason)
 
 		list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node)
 			wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages),
-						true, reason);
+						reason);
 	}
 	rcu_read_unlock();
 }

include/linux/backing-dev.h

@@ -39,7 +39,7 @@ static inline struct backing_dev_info *bdi_alloc(gfp_t gfp_mask)
 }
 
 void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
-			bool range_cyclic, enum wb_reason reason);
+			enum wb_reason reason);
 void wb_start_background_writeback(struct bdi_writeback *wb);
 void wb_workfn(struct work_struct *work);
 void wb_wakeup_delayed(struct bdi_writeback *wb);

mm/page-writeback.c

@@ -1994,8 +1994,8 @@ void laptop_mode_timer_fn(unsigned long data)
 	rcu_read_lock();
 	list_for_each_entry_rcu(wb, &q->backing_dev_info->wb_list, bdi_node)
 		if (wb_has_dirty_io(wb))
-			wb_start_writeback(wb, nr_pages, true,
-					   WB_REASON_LAPTOP_TIMER);
+			wb_start_writeback(wb, nr_pages,
+						WB_REASON_LAPTOP_TIMER);
 	rcu_read_unlock();
 }