mm: memory: remove ->vm_file check on shared writable vmas

Shared anonymous mmaps are implemented with shmem files, so all VMAs with shared writable semantics also have an underlying backing file. Signed-off-by: Johannes Weiner <[email protected]> Reviewed-by: Jan Kara <[email protected]> Acked-by: Kirill A. Shutemov <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
cbmeeks · Feb 10, 2015 · 74ec675 · 74ec675
1 parent d9ecee2
commit 74ec675
Showing 1 changed file with 2 additions and 5 deletions.
diff --git a/mm/memory.c b/mm/memory.c
@@ -2127,9 +2127,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
 				balance_dirty_pages_ratelimited(mapping);
 			}
 
-			/* file_update_time outside page_lock */
-			if (vma->vm_file)
-				file_update_time(vma->vm_file);
+			file_update_time(vma->vm_file);
 		}
 		put_page(dirty_page);
 		if (page_mkwrite) {
@@ -2971,8 +2969,7 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 		balance_dirty_pages_ratelimited(mapping);
 	}
 
-	/* file_update_time outside page_lock */
-	if (vma->vm_file && !vma->vm_ops->page_mkwrite)
+	if (!vma->vm_ops->page_mkwrite)
 		file_update_time(vma->vm_file);
 
 	return ret;