2 files changed, 2 insertions, 0 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index c6049e947cd9..4fb1546bbad6 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -63,6 +63,7 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *    ->private_lock            (__free_pte->__set_page_dirty_buffers)
  *      ->swap_lock             (exclusive_swap_page, others)
  *        ->mapping->tree_lock
+ *          ->zone.lock
  *
  *  ->i_mutex
  *    ->i_mmap_lock             (truncate->unmap_mapping_range)
diff --git a/mm/rmap.c b/mm/rmap.c
index f6e85d7a7e45..8990f909492f 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -36,6 +36,7 @@
  *                 mapping->tree_lock (widely used, in set_page_dirty,
  *                           in arch-dependent flush_dcache_mmap_lock,
  *                           within inode_lock in __sync_single_inode)
+ *                   zone->lock (within radix tree node alloc)
  */
 
 #include <linux/mm.h>