diff --git a/libc/kernel/common/asm-generic/bitops/__ffs.h b/libc/kernel/common/asm-generic/bitops/__ffs.h
index 3d135bd..ecc1939 100644
--- a/libc/kernel/common/asm-generic/bitops/__ffs.h
+++ b/libc/kernel/common/asm-generic/bitops/__ffs.h
@@ -7,13 +7,19 @@
  ***   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_BITOPS___FFS_H_
 #define _ASM_GENERIC_BITOPS___FFS_H_
-
 #include <asm/types.h>
-
 #if BITS_PER_LONG == 64
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #endif
diff --git a/libc/kernel/common/asm-generic/bitops/atomic.h b/libc/kernel/common/asm-generic/bitops/atomic.h
index 5f53ba9..b054bc9 100644
--- a/libc/kernel/common/asm-generic/bitops/atomic.h
+++ b/libc/kernel/common/asm-generic/bitops/atomic.h
@@ -7,17 +7,22 @@
  ***   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_BITOPS_ATOMIC_H_
 #define _ASM_GENERIC_BITOPS_ATOMIC_H_
-
 #include <asm/types.h>
-
 #define BITOP_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
-
 #define _atomic_spin_lock_irqsave(l,f) do { local_irq_save(f); } while (0)
 #define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
diff --git a/libc/kernel/common/asm-generic/bitops/ffz.h b/libc/kernel/common/asm-generic/bitops/ffz.h
index 18da271..1f2eba5 100644
--- a/libc/kernel/common/asm-generic/bitops/ffz.h
+++ b/libc/kernel/common/asm-generic/bitops/ffz.h
@@ -7,11 +7,17 @@
  ***   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_BITOPS_FFZ_H_
 #define _ASM_GENERIC_BITOPS_FFZ_H_
-
 #define ffz(x) __ffs(~(x))
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
diff --git a/libc/kernel/common/asm-generic/bitops/find.h b/libc/kernel/common/asm-generic/bitops/find.h
index 8361cfe..0de0f7d 100644
--- a/libc/kernel/common/asm-generic/bitops/find.h
+++ b/libc/kernel/common/asm-generic/bitops/find.h
@@ -7,12 +7,18 @@
  ***   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_BITOPS_FIND_H_
 #define _ASM_GENERIC_BITOPS_FIND_H_
-
 #define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
 #define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
diff --git a/libc/kernel/common/asm-generic/bitops/fls.h b/libc/kernel/common/asm-generic/bitops/fls.h
index 8adbf31..e4326b7 100644
--- a/libc/kernel/common/asm-generic/bitops/fls.h
+++ b/libc/kernel/common/asm-generic/bitops/fls.h
@@ -7,9 +7,15 @@
  ***   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_BITOPS_FLS_H_
 #define _ASM_GENERIC_BITOPS_FLS_H_
-
 #endif
diff --git a/libc/kernel/common/asm-generic/bitops/fls64.h b/libc/kernel/common/asm-generic/bitops/fls64.h
index af77098..3769f63 100644
--- a/libc/kernel/common/asm-generic/bitops/fls64.h
+++ b/libc/kernel/common/asm-generic/bitops/fls64.h
@@ -7,11 +7,17 @@
  ***   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_BITOPS_FLS64_H_
 #define _ASM_GENERIC_BITOPS_FLS64_H_
-
 #include <asm/types.h>
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
diff --git a/libc/kernel/common/asm-generic/bitops/le.h b/libc/kernel/common/asm-generic/bitops/le.h
index 97ca973..9d6dd78 100644
--- a/libc/kernel/common/asm-generic/bitops/le.h
+++ b/libc/kernel/common/asm-generic/bitops/le.h
@@ -7,47 +7,47 @@
  ***   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_BITOPS_LE_H_
 #define _ASM_GENERIC_BITOPS_LE_H_
-
 #include <asm/types.h>
 #include <asm/byteorder.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
 #define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7)
-
 #ifdef __LITTLE_ENDIAN
-
 #define generic_test_le_bit(nr, addr) test_bit(nr, addr)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define generic___set_le_bit(nr, addr) __set_bit(nr, addr)
 #define generic___clear_le_bit(nr, addr) __clear_bit(nr, addr)
-
 #define generic_test_and_set_le_bit(nr, addr) test_and_set_bit(nr, addr)
 #define generic_test_and_clear_le_bit(nr, addr) test_and_clear_bit(nr, addr)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define generic___test_and_set_le_bit(nr, addr) __test_and_set_bit(nr, addr)
 #define generic___test_and_clear_le_bit(nr, addr) __test_and_clear_bit(nr, addr)
-
 #define generic_find_next_zero_le_bit(addr, size, offset) find_next_zero_bit(addr, size, offset)
-
 #elif defined(__BIG_ENDIAN)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define generic_test_le_bit(nr, addr)   test_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
 #define generic___set_le_bit(nr, addr)   __set_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
 #define generic___clear_le_bit(nr, addr)   __clear_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
-
 #define generic_test_and_set_le_bit(nr, addr)   test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define generic_test_and_clear_le_bit(nr, addr)   test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
-
 #define generic___test_and_set_le_bit(nr, addr)   __test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
 #define generic___test_and_clear_le_bit(nr, addr)   __test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
-
 #else
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #error "Please fix <asm/byteorder.h>"
 #endif
-
 #define generic_find_first_zero_le_bit(addr, size)   generic_find_next_zero_le_bit((addr), (size), 0)
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
diff --git a/libc/kernel/common/asm-generic/bitops/non-atomic.h b/libc/kernel/common/asm-generic/bitops/non-atomic.h
index 727f736..5f2866e 100644
--- a/libc/kernel/common/asm-generic/bitops/non-atomic.h
+++ b/libc/kernel/common/asm-generic/bitops/non-atomic.h
@@ -7,14 +7,19 @@
  ***   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_BITOPS_NON_ATOMIC_H_
 #define _ASM_GENERIC_BITOPS_NON_ATOMIC_H_
-
 #include <asm/types.h>
-
 #define BITOP_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
-
 #endif