On Tue, 26 Sep 2017 15:14:17 +0800 changbin...@intel.com wrote:
> 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.
>
> ...
>
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -47,8 +47,8 @@ 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.
> */
> void *s_mem; /* slab first object */
> atomic_t compound_mapcount; /* first tail page */
Why did you remove the (useful) reference to PAGE_MAPPING_ANON?
