From: Changbin Du <changbin...@intel.com>

The struct page.mapping can NULL or points to one object of type
address_space, anon_vma or KSM private structure.

Signed-off-by: Changbin Du <changbin...@intel.com>
---
v2: add back flag reference.

---
 include/linux/mm_types.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 46f4ecf5..6d4c51a 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -47,8 +47,10 @@ struct page {
                                                 * inode address_space, or NULL.
                                                 * If page mapped as anonymous
                                                 * memory, low bit is set, and
-                                                * it points to anon_vma object:
-                                                * see PAGE_MAPPING_ANON below.
+                                                * it points to anon_vma object
+                                                * or KSM private structure. See
+                                                * PAGE_MAPPING_ANON and
+                                                * PAGE_MAPPING_KSM.
                                                 */
                void *s_mem;                    /* slab first object */
                atomic_t compound_mapcount;     /* first tail page */
-- 
2.7.4

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