diff --git a/libc/kernel/common/linux/dm-ioctl.h b/libc/kernel/common/linux/dm-ioctl.h
index ead7744..aa9521f 100644
--- a/libc/kernel/common/linux/dm-ioctl.h
+++ b/libc/kernel/common/linux/dm-ioctl.h
@@ -7,140 +7,133 @@
  ***   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_DM_IOCTL_V4_H
 #define _LINUX_DM_IOCTL_V4_H
-
 #include <linux/types.h>
-
 #define DM_DIR "mapper"  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DM_MAX_TYPE_NAME 16
 #define DM_NAME_LEN 128
 #define DM_UUID_LEN 129
-
 struct dm_ioctl {
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  uint32_t version[3];
  uint32_t data_size;
-
  uint32_t data_start;
-
  uint32_t target_count;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int32_t open_count;
  uint32_t flags;
  uint32_t event_nr;
  uint32_t padding;
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  uint64_t dev;
-
  char name[DM_NAME_LEN];
  char uuid[DM_UUID_LEN];
  char data[7];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 struct dm_target_spec {
  uint64_t sector_start;
  uint64_t length;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int32_t status;
-
  uint32_t next;
-
  char target_type[DM_MAX_TYPE_NAME];
-
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct dm_target_deps {
  uint32_t count;
  uint32_t padding;
  uint64_t dev[0];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 struct dm_name_list {
  uint64_t dev;
  uint32_t next;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  char name[0];
 };
-
 struct dm_target_versions {
  uint32_t next;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  uint32_t version[3];
-
  char name[0];
 };
-
 struct dm_target_msg {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  uint64_t sector;
-
  char message[0];
 };
-
 enum {
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DM_VERSION_CMD = 0,
  DM_REMOVE_ALL_CMD,
  DM_LIST_DEVICES_CMD,
-
  DM_DEV_CREATE_CMD,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DM_DEV_REMOVE_CMD,
  DM_DEV_RENAME_CMD,
  DM_DEV_SUSPEND_CMD,
  DM_DEV_STATUS_CMD,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DM_DEV_WAIT_CMD,
-
  DM_TABLE_LOAD_CMD,
  DM_TABLE_CLEAR_CMD,
  DM_TABLE_DEPS_CMD,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DM_TABLE_STATUS_CMD,
-
  DM_LIST_VERSIONS_CMD,
  DM_TARGET_MSG_CMD,
  DM_DEV_SET_GEOMETRY_CMD
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 #define DM_IOCTL 0xfd
-
 #define DM_VERSION _IOWR(DM_IOCTL, DM_VERSION_CMD, struct dm_ioctl)
 #define DM_REMOVE_ALL _IOWR(DM_IOCTL, DM_REMOVE_ALL_CMD, struct dm_ioctl)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DM_LIST_DEVICES _IOWR(DM_IOCTL, DM_LIST_DEVICES_CMD, struct dm_ioctl)
-
 #define DM_DEV_CREATE _IOWR(DM_IOCTL, DM_DEV_CREATE_CMD, struct dm_ioctl)
 #define DM_DEV_REMOVE _IOWR(DM_IOCTL, DM_DEV_REMOVE_CMD, struct dm_ioctl)
 #define DM_DEV_RENAME _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD, struct dm_ioctl)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DM_DEV_SUSPEND _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD, struct dm_ioctl)
 #define DM_DEV_STATUS _IOWR(DM_IOCTL, DM_DEV_STATUS_CMD, struct dm_ioctl)
 #define DM_DEV_WAIT _IOWR(DM_IOCTL, DM_DEV_WAIT_CMD, struct dm_ioctl)
-
 #define DM_TABLE_LOAD _IOWR(DM_IOCTL, DM_TABLE_LOAD_CMD, struct dm_ioctl)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DM_TABLE_CLEAR _IOWR(DM_IOCTL, DM_TABLE_CLEAR_CMD, struct dm_ioctl)
 #define DM_TABLE_DEPS _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl)
 #define DM_TABLE_STATUS _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, struct dm_ioctl)
-
 #define DM_LIST_VERSIONS _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, struct dm_ioctl)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DM_TARGET_MSG _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl)
 #define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
-
 #define DM_VERSION_MAJOR 4
 #define DM_VERSION_MINOR 14
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DM_VERSION_PATCHLEVEL 0
 #define DM_VERSION_EXTRA "-ioctl (2008-04-23)"
-
 #define DM_READONLY_FLAG (1 << 0)  
 #define DM_SUSPEND_FLAG (1 << 1)  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DM_PERSISTENT_DEV_FLAG (1 << 3)  
-
 #define DM_STATUS_TABLE_FLAG (1 << 4)  
-
 #define DM_ACTIVE_PRESENT_FLAG (1 << 5)  
 #define DM_INACTIVE_PRESENT_FLAG (1 << 6)  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DM_BUFFER_FULL_FLAG (1 << 8)  
-
 #define DM_SKIP_BDGET_FLAG (1 << 9)  
-
 #define DM_SKIP_LOCKFS_FLAG (1 << 10)  
-
 #define DM_NOFLUSH_FLAG (1 << 11)  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif