[PATCH 4/4] mm: convert make_page_accessed to use compount_page_t()

[Kirill A. Shutemov]

Just for example, convert one function to just created interface.

This way we cut size of the function by third:

function                                     old     new   delta
mark_page_accessed                           310     203    -107

Not-yet-signed-off-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com>
---
 mm/swap.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index 09fe5e97714a..1fe072ae6ee1 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -360,9 +360,10 @@ static void __lru_cache_activate_page(struct page *page)
  */
 void mark_page_accessed(struct page *page)
 {
-       page = compound_head(page);
-       if (!PageActive(page) && !PageUnevictable(page) &&
-                       PageReferenced(page)) {
+       struct head_page *head = compound_head_t(page);
+       page = &head->page;
+       if (!PageActive(head) && !PageUnevictable(head) &&
+                       PageReferenced(head)) {
 
                /*
                 * If the page is on the LRU, queue it for activation via
@@ -370,15 +371,15 @@ void mark_page_accessed(struct page *page)
                 * pagevec, mark it active and it'll be moved to the active
                 * LRU on the next drain.
                 */
-               if (PageLRU(page))
+               if (PageLRU(head))
                        activate_page(page);
                else
                        __lru_cache_activate_page(page);
-               ClearPageReferenced(page);
+               ClearPageReferenced(head);
                if (page_is_file_cache(page))
                        workingset_activation(page);
-       } else if (!PageReferenced(page)) {
-               SetPageReferenced(page);
+       } else if (!PageReferenced(head)) {
+               SetPageReferenced(head);
        }
        if (page_is_idle(page))
                clear_page_idle(page);
-- 
2.8.0.rc3