diff --git a/[refs] b/[refs]
index 3acec5d75cdd..1528a91ab99d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c27fe4c8942d3ca715986f79cc26f44608d7d9fb
+refs/heads/master: dd78553b5e7a0b34c0b60478d04ee16d8d8f4fa7
diff --git a/trunk/mm/pagewalk.c b/trunk/mm/pagewalk.c
index f7929406e776..2f5cf10ff660 100644
--- a/trunk/mm/pagewalk.c
+++ b/trunk/mm/pagewalk.c
@@ -176,7 +176,8 @@ static int walk_hugetlb_range(struct vm_area_struct *vma,
  * associated range, and a copy of the original mm_walk for access to
  * the ->private or ->mm fields.
  *
- * No locks are taken, but the bottom level iterator will map PTE
+ * Usually no locks are taken, but splitting transparent huge page may
+ * take page table lock. And the bottom level iterator will map PTE
  * directories from highmem if necessary.
  *
  * If any callback returns a non-zero value, the walk is aborted and