On Sat 16-12-17 08:44:21, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
>
> The comment on page->mapping is terse, and out of date (it does not
> mention the possibility of PAGE_MAPPING_MOVABLE). Instead, point
> the interested reader to page-flags.h where there is a much better
> comment.
>
> Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> include/linux/mm_types.h | 12 +++---------
> 1 file changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index c2294e6204e8..8c3b8cea22ee 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -50,15 +50,9 @@ struct page {
> unsigned long flags; /* Atomic flags, some possibly
> * updated asynchronously */
> union {
> - struct address_space *mapping; /* If low bit clear, points to
> - * inode address_space, or NULL.
> - * If page mapped as anonymous
> - * memory, low bit is set, and
> - * it points to anon_vma object
> - * or KSM private structure. See
> - * PAGE_MAPPING_ANON and
> - * PAGE_MAPPING_KSM.
> - */
> + /* See page-flags.h for the definition of PAGE_MAPPING_FLAGS */
> + struct address_space *mapping;
> +
> void *s_mem; /* slab first object */
> atomic_t compound_mapcount; /* first tail page */
> /* page_deferred_list().next -- second tail page */
> --
> 2.15.1
>
> --
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--
Michal Hocko
SUSE Labs
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