mm: thp: microoptimize compound_mapcount()

[karo-tx-linux.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2b97be1147ecf640dcfa9f7d1707d17a3a1738ef..65d18a45b8e8452c646c55ad32b6c40a71c31457 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -475,8 +475,7 @@ static inline atomic_t *compound_mapcount_ptr(struct page *page)
 
 static inline int compound_mapcount(struct page *page)
 {
-       if (!PageCompound(page))
-               return 0;
+       VM_BUG_ON_PAGE(!PageCompound(page), page);
        page = compound_head(page);
        return atomic_read(compound_mapcount_ptr(page)) + 1;
 }