On Fri, 15 Apr 2011, Phil Carmody wrote:
> +++ b/include/linux/mm.h
> @@ -353,9 +353,16 @@ static inline struct page *compound_head(struct page *page)
> return page;
> }
>
> -static inline int page_count(struct page *page)
> +static inline const struct page *compound_head_ro(const struct page *page)
> {
> - return atomic_read(&compound_head(page)->_count);
> + if (unlikely(PageTail(page)))
> + return page->first_page;
> + return page;
> +}
Can you make compound_head take a const pointer too to avoid this?
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