mm: thp: __get_page_tail_foll() can use get_huge_page_tail()

Cleanup. Change __get_page_tail_foll() to use get_huge_page_tail()
to avoid the code duplication.

Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Dave Jones <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Mel Gorman <[email protected]>
Acked-by: Andrea Arcangeli <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/internal.h b/mm/internal.h
index a85a3ab1f7ef2d2d77b736fd627b3c8fde1341f9..a346ba120e4211e49473350c3a933afa26a43625 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -47,12 +47,9 @@ static inline void __get_page_tail_foll(struct page *page,
         * page_cache_get_speculative()) on tail pages.
         */
        VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0);
-       VM_BUG_ON(atomic_read(&page->_count) != 0);
-       VM_BUG_ON(page_mapcount(page) < 0);
        if (get_page_head)
                atomic_inc(&page->first_page->_count);
-       if (compound_tail_refcounted(page->first_page))
-               atomic_inc(&page->_mapcount);
+       get_huge_page_tail(page);
 }
 
 /*