diff --git a/[refs] b/[refs]
index 8b879ce774f5..85dd52c3f664 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b827e496c893de0c0f142abfaeb8730a2fd6b37f
+refs/heads/master: 0816178638c15ce5472d39d771a96860dff4141a
diff --git a/trunk/fs/proc/task_mmu.c b/trunk/fs/proc/task_mmu.c
index 39e4ad4f59f4..6f61b7cc32e0 100644
--- a/trunk/fs/proc/task_mmu.c
+++ b/trunk/fs/proc/task_mmu.c
@@ -665,6 +665,10 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
 		goto out_task;
 
 	ret = 0;
+
+	if (!count)
+		goto out_task;
+
 	mm = get_task_mm(task);
 	if (!mm)
 		goto out_task;