diff --git a/libc/kernel/common/asm-generic/fcntl.h b/libc/kernel/common/asm-generic/fcntl.h
index a53b536..0944a2a 100644
--- a/libc/kernel/common/asm-generic/fcntl.h
+++ b/libc/kernel/common/asm-generic/fcntl.h
@@ -7,142 +7,163 @@
  ***   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 _ASM_GENERIC_FCNTL_H
 #define _ASM_GENERIC_FCNTL_H
-
 #include <linux/types.h>
-
 #define O_ACCMODE 00000003
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define O_RDONLY 00000000
 #define O_WRONLY 00000001
 #define O_RDWR 00000002
 #ifndef O_CREAT
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define O_CREAT 00000100  
 #endif
 #ifndef O_EXCL
 #define O_EXCL 00000200  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #ifndef O_NOCTTY
 #define O_NOCTTY 00000400  
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef O_TRUNC
 #define O_TRUNC 00001000  
 #endif
 #ifndef O_APPEND
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define O_APPEND 00002000
 #endif
 #ifndef O_NONBLOCK
 #define O_NONBLOCK 00004000
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #ifndef O_SYNC
 #define O_SYNC 00010000
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef FASYNC
 #define FASYNC 00020000  
 #endif
 #ifndef O_DIRECT
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define O_DIRECT 00040000  
 #endif
 #ifndef O_LARGEFILE
 #define O_LARGEFILE 00100000
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #ifndef O_DIRECTORY
 #define O_DIRECTORY 00200000  
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef O_NOFOLLOW
 #define O_NOFOLLOW 00400000  
 #endif
 #ifndef O_NOATIME
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define O_NOATIME 01000000
 #endif
 #ifndef O_NDELAY
 #define O_NDELAY O_NONBLOCK
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #define F_DUPFD 0  
 #define F_GETFD 1  
 #define F_SETFD 2  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define F_GETFL 3  
 #define F_SETFL 4  
 #ifndef F_GETLK
 #define F_GETLK 5
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define F_SETLK 6
 #define F_SETLKW 7
 #endif
 #ifndef F_SETOWN
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define F_SETOWN 8  
 #define F_GETOWN 9  
 #endif
 #ifndef F_SETSIG
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define F_SETSIG 10  
 #define F_GETSIG 11  
 #endif
-
 #define FD_CLOEXEC 1  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef F_RDLCK
 #define F_RDLCK 0
 #define F_WRLCK 1
 #define F_UNLCK 2
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #ifndef F_EXLCK
 #define F_EXLCK 4  
 #define F_SHLCK 8  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #ifndef F_INPROGRESS
 #define F_INPROGRESS 16
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LOCK_SH 1  
 #define LOCK_EX 2  
 #define LOCK_NB 4  
 #define LOCK_UN 8  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LOCK_MAND 32  
 #define LOCK_READ 64  
 #define LOCK_WRITE 128  
 #define LOCK_RW 192  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define F_LINUX_SPECIFIC_BASE 1024
-
 #ifndef HAVE_ARCH_STRUCT_FLOCK
 #ifndef __ARCH_FLOCK_PAD
 #define __ARCH_FLOCK_PAD
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 struct flock {
  short l_type;
  short l_whence;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  off_t l_start;
  off_t l_len;
  pid_t l_pid;
  __ARCH_FLOCK_PAD
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 #endif
-
 #ifndef F_GETLK64
 #define F_GETLK64 12  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define F_SETLK64 13
 #define F_SETLKW64 14
 #endif
-
 #ifndef HAVE_ARCH_STRUCT_FLOCK64
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef __ARCH_FLOCK64_PAD
 #define __ARCH_FLOCK64_PAD
 #endif
-
 struct flock64 {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  short l_type;
  short l_whence;
  loff_t l_start;
  loff_t l_len;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  pid_t l_pid;
  __ARCH_FLOCK64_PAD
 };
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif