Update bionic kernel headers using update_all.py

Change-Id: I9c377436e9bf158e7236b3b7dcebf3e79fa961de
diff --git a/libc/kernel/common/linux/blockgroup_lock.h b/libc/kernel/common/linux/blockgroup_lock.h
index c814020..f68edbb 100644
--- a/libc/kernel/common/linux/blockgroup_lock.h
+++ b/libc/kernel/common/linux/blockgroup_lock.h
@@ -7,23 +7,28 @@
  ***   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_BLOCKGROUP_LOCK_H
 #define _LINUX_BLOCKGROUP_LOCK_H
-
 #include <linux/spinlock.h>
 #include <linux/cache.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NR_BG_LOCKS 1
-
 struct bgl_lock {
  spinlock_t lock;
 } ____cacheline_aligned_in_smp;
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct blockgroup_lock {
  struct bgl_lock locks[NR_BG_LOCKS];
 };
-
 #define sb_bgl_lock(sb, block_group)   (&(sb)->s_blockgroup_lock.locks[(block_group) & (NR_BG_LOCKS-1)].lock)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif