Matthew Wilcox <willy@xxxxxxxxxxxxx> writes:
> static inline unsigned hstate_index_to_shift(unsigned index)
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 5411de93a363e..e920ef9927539 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -712,6 +712,12 @@ static inline void set_compound_order(struct page *page, unsigned int order)
> page[1].compound_order = order;
> }
>
> +/* Returns the number of bytes in this potentially compound page. */
> +static inline unsigned long page_size(struct page *page)
> +{
> + return (unsigned long)PAGE_SIZE << compound_order(page);
> +}
> +
How about compound_page_size() to make it clear this is for
compound_pages? Should we make it work with Tail pages by doing
compound_head(page)?
-aneesh
