diff --git a/[refs] b/[refs]
index 9435eec79458..096b33a3fc8e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: bcd78e49613c41b5bed96fa288e983876f286a59
+refs/heads/master: cce770815869e9209171d819dfde89bcc738ab62
diff --git a/trunk/fs/sync.c b/trunk/fs/sync.c
index 228e17b5e9ee..2967562d416f 100644
--- a/trunk/fs/sync.c
+++ b/trunk/fs/sync.c
@@ -139,7 +139,8 @@ asmlinkage long sys_fdatasync(unsigned int fd)
  * before performing the write.
  *
  * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
- * range which are not presently under writeback.
+ * range which are not presently under writeback. Note that this may block for
+ * significant periods due to exhaustion of disk request structures.
  *
  * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
  * after performing the write.