diff --git a/mm/madvise.c b/mm/madvise.c
index 25bade36e9ca..fd70d6aabc3e 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -757,6 +757,9 @@ madvise_behavior_valid(int behavior)
  *  MADV_DONTFORK - omit this area from child's address space when forking:
  *		typically, to avoid COWing pages pinned by get_user_pages().
  *  MADV_DOFORK - cancel MADV_DONTFORK: no longer omit this area when forking.
+ *  MADV_WIPEONFORK - present the child process with zero-filled memory in this
+ *              range after a fork.
+ *  MADV_KEEPONFORK - undo the effect of MADV_WIPEONFORK
  *  MADV_HWPOISON - trigger memory error handler as if the given memory range
  *		were corrupted by unrecoverable hardware memory failure.
  *  MADV_SOFT_OFFLINE - try to soft-offline the given range of memory.
@@ -777,7 +780,9 @@ madvise_behavior_valid(int behavior)
  *  zero    - success
  *  -EINVAL - start + len < 0, start is not page-aligned,
  *		"behavior" is not a valid value, or application
- *		is attempting to release locked or shared pages.
+ *		is attempting to release locked or shared pages,
+ *		or the specified address range includes file, Huge TLB,
+ *		MAP_SHARED or VMPFNMAP range.
  *  -ENOMEM - addresses in the specified range are not currently
  *		mapped, or are outside the AS of the process.
  *  -EIO    - an I/O error occurred while paging in data.