diff --git a/libc/kernel/common/linux/lockdep.h b/libc/kernel/common/linux/lockdep.h
index f5e8634..c6d6e4f 100644
--- a/libc/kernel/common/linux/lockdep.h
+++ b/libc/kernel/common/linux/lockdep.h
@@ -7,46 +7,52 @@
  ***   structures, and macros generated from the original header, and thus,
  ***   contains no copyrightable information.
  ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
  ****************************************************************************
  ****************************************************************************/
 #ifndef __LINUX_LOCKDEP_H
 #define __LINUX_LOCKDEP_H
-
 #include <linux/linkage.h>
 #include <linux/list.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/debug_locks.h>
 #include <linux/stacktrace.h>
-
 #define lock_acquire(l, s, t, r, c, i) do { } while (0)
 #define lock_release(l, n, i) do { } while (0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define lockdep_init() do { } while (0)
 #define lockdep_info() do { } while (0)
 #define lockdep_init_map(lock, name, key) do { (void)(key); } while (0)
 #define lockdep_set_class(lock, key) do { (void)(key); } while (0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define lockdep_set_class_and_name(lock, key, name)   do { (void)(key); } while (0)
 #define INIT_LOCKDEP
 #define lockdep_reset() do { debug_locks = 1; } while (0)
 #define lockdep_free_key_range(start, size) do { } while (0)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct lock_class_key { };
 #define early_init_irq_lock_class() do { } while (0)
-
 #define early_boot_irqs_off() do { } while (0)
 #define early_boot_irqs_on() do { } while (0)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SINGLE_DEPTH_NESTING 1
-
 #define spin_acquire(l, s, t, i) do { } while (0)
 #define spin_release(l, n, i) do { } while (0)
-
 #define rwlock_acquire(l, s, t, i) do { } while (0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define rwlock_acquire_read(l, s, t, i) do { } while (0)
 #define rwlock_release(l, n, i) do { } while (0)
-
 #define mutex_acquire(l, s, t, i) do { } while (0)
 #define mutex_release(l, n, i) do { } while (0)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define rwsem_acquire(l, s, t, i) do { } while (0)
 #define rwsem_acquire_read(l, s, t, i) do { } while (0)
 #define rwsem_release(l, n, i) do { } while (0)
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */