1 files changed, 35 insertions, 12 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index f50a2811f9dc..b0ceb29da4c7 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -5,6 +5,41 @@
 #include <linux/sched.h>
 #include <linux/module.h>
 
+int bdi_init(struct backing_dev_info *bdi)
+{
+        int i, j;
+        int err;
+
+        for (i = 0; i < NR_BDI_STAT_ITEMS; i++) {
+                err = percpu_counter_init_irq(&bdi->bdi_stat[i], 0);
+                if (err)
+                        goto err;
+        }
+
+        bdi->dirty_exceeded = 0;
+        err = prop_local_init_percpu(&bdi->completions);
+
+        if (err) {
+err:
+                for (j = 0; j < i; j++)
+                        percpu_counter_destroy(&bdi->bdi_stat[i]);
+        }
+
+        return err;
+}
+EXPORT_SYMBOL(bdi_init);
+
+void bdi_destroy(struct backing_dev_info *bdi)
+{
+        int i;
+
+        for (i = 0; i < NR_BDI_STAT_ITEMS; i++)
+                percpu_counter_destroy(&bdi->bdi_stat[i]);
+
+        prop_local_destroy_percpu(&bdi->completions);
+}
+EXPORT_SYMBOL(bdi_destroy);
+
 static wait_queue_head_t congestion_wqh[2] = {
                 __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]),
                 __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1])
@@ -55,15 +90,3 @@ long congestion_wait(int rw, long timeout)
 }
 EXPORT_SYMBOL(congestion_wait);
 
-/**
- * congestion_end - wake up sleepers on a congested backing_dev_info
- * @rw: READ or WRITE
- */
-void congestion_end(int rw)
-{
-        wait_queue_head_t *wqh = &congestion_wqh[rw];
-
-        if (waitqueue_active(wqh))
-                wake_up(wqh);
-}
-EXPORT_SYMBOL(congestion_end);