[PATCH] uml: locking commentary in the random driver

[firefly-linux-kernel-4.4.55.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index ef09f0acb1d8efc25fed1a524cada7cab48d40ef..0e6a402d86bee7edf968b1ef97f8b46a42f37a52 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -678,7 +678,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
                                if (pte_dirty(ptent))
                                        set_page_dirty(page);
                                if (pte_young(ptent))
-                                       mark_page_accessed(page);
+                                       SetPageReferenced(page);
                                file_rss--;
                        }
                        page_remove_rmap(page, vma);
@@ -1531,8 +1531,6 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
                        if (vma->vm_ops->page_mkwrite(vma, old_page) < 0)
                                goto unwritable_page;
 
-                       page_cache_release(old_page);
-
                        /*
                         * Since we dropped the lock we need to revalidate
                         * the PTE as someone else may have changed it.  If
@@ -1541,6 +1539,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
                         */
                        page_table = pte_offset_map_lock(mm, pmd, address,
                                                         &ptl);
+                       page_cache_release(old_page);
                        if (!pte_same(*page_table, orig_pte))
                                goto unlock;
                }