On Sun, Jan 02, 2022 at 09:57:15PM +0000, Matthew Wilcox (Oracle) wrote:
> This is the folio equivalent of compound_pincount_ptr().
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> ---
> include/linux/mm_types.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index c3a6e6209600..09d9e2c4a2c5 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -309,6 +309,12 @@ static inline atomic_t *compound_mapcount_ptr(struct page *page)
> return &page[1].compound_mapcount;
> }
>
> +static inline atomic_t *folio_pincount_ptr(struct folio *folio)
> +{
> + struct page *tail = &folio->page + 2;
> + return &tail->hpage_pinned_refcount;
Missing empty line? Except for that and the fact that I dislike the
pre-existing magic numbers this looks fine.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
