Merge branch 'uaccess.readdir' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull uaccess/readdir updates from Al Viro:
 "Finishing the conversion of readdir.c to unsafe_... API.

  This includes the uaccess_{read,write}_begin series by Christophe
  Leroy"

* 'uaccess.readdir' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  readdir.c: get rid of the last __put_user(), drop now-useless access_ok()
  readdir.c: get compat_filldir() more or less in sync with filldir()
  switch readdir(2) to unsafe_copy_dirent_name()
  drm/i915/gem: Replace user_access_begin by user_write_access_begin
  uaccess: Selectively open read or write user access
  uaccess: Add user_read_access_begin/end and user_write_access_begin/end

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

@@ -2794,7 +2794,8 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
 		 * And this range already got effectively checked earlier
 		 * when we did the "copy_from_user()" above.
 		 */
-		if (!user_access_begin(user_exec_list, count * sizeof(*user_exec_list)))
+		if (!user_write_access_begin(user_exec_list,
+					     count * sizeof(*user_exec_list)))
 			goto end;
 
 		for (i = 0; i < args->buffer_count; i++) {
@@ -2808,7 +2809,7 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
 					end_user);
 		}
 end_user:
-		user_access_end();
+		user_write_access_end();
 end:;
 	}