diff --git a/libc/kernel/common/linux/jiffies.h b/libc/kernel/common/linux/jiffies.h
index 86b705b..cdfefcb 100644
--- a/libc/kernel/common/linux/jiffies.h
+++ b/libc/kernel/common/linux/jiffies.h
@@ -7,109 +7,124 @@
  ***   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_JIFFIES_H
 #define _LINUX_JIFFIES_H
-
 #include <linux/calc64.h>
 #include <linux/kernel.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/types.h>
 #include <linux/time.h>
 #include <linux/timex.h>
 #include <asm/param.h>  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #if HZ >= (12 && HZ < 24)
 #define SHIFT_HZ 4
 #elif HZ >= 24 && HZ < 48
 #define SHIFT_HZ 5
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #elif HZ >= 48 && HZ < 96
 #define SHIFT_HZ 6
 #elif HZ >= 96 && HZ < 192
 #define SHIFT_HZ 7
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #elif HZ >= 192 && HZ < 384
 #define SHIFT_HZ 8
 #elif HZ >= 384 && HZ < 768
 #define SHIFT_HZ 9
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #elif HZ >= 768 && HZ < 1536
 #define SHIFT_HZ 10
 #else
 #error You lose.
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ)  
-
 #define LATCH_HPET ((HPET_TICK_RATE + HZ/2) / HZ)
-
 #define SH_DIV(NOM,DEN,LSH) ( (((NOM) / (DEN)) << (LSH))   + ((((NOM) % (DEN)) << (LSH)) + (DEN) / 2) / (DEN))
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ACTHZ (SH_DIV (CLOCK_TICK_RATE, LATCH, 8))
-
 #define ACTHZ_HPET (SH_DIV (HPET_TICK_RATE, LATCH_HPET, 8))
-
 #define TICK_NSEC (SH_DIV (1000000UL * 1000, ACTHZ, 8))
-
 #define TICK_NSEC_HPET (SH_DIV(1000000UL * 1000, ACTHZ_HPET, 8))
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
-
 #define TICK_USEC_TO_NSEC(TUSEC) (SH_DIV (TUSEC * USER_HZ * 1000, ACTHZ, 8))
-
 #define __jiffy_data __attribute__((section(".data")))
-
 #if BITS_PER_LONG < 64
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #else
 #endif
 #define time_after(a,b)   (typecheck(unsigned long, a) &&   typecheck(unsigned long, b) &&   ((long)(b) - (long)(a) < 0))
 #define time_before(a,b) time_after(b,a)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define time_after_eq(a,b)   (typecheck(unsigned long, a) &&   typecheck(unsigned long, b) &&   ((long)(a) - (long)(b) >= 0))
 #define time_before_eq(a,b) time_after_eq(b,a)
 #define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))
 #define MAX_JIFFY_OFFSET ((~0UL >> 1)-1)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SEC_JIFFIE_SC (31 - SHIFT_HZ)
 #if !((NSEC_PER_SEC << 2) / TICK_NSEC << SEC_JIFFIE_SC - 2 & 0x80000000)
 #undef SEC_JIFFIE_SC
 #define SEC_JIFFIE_SC (32 - SHIFT_HZ)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #define NSEC_JIFFIE_SC (SEC_JIFFIE_SC + 29)
 #define USEC_JIFFIE_SC (SEC_JIFFIE_SC + 19)
 #define SEC_CONVERSION ((unsigned long)((((u64)NSEC_PER_SEC << SEC_JIFFIE_SC) +  TICK_NSEC -1) / (u64)TICK_NSEC))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NSEC_CONVERSION ((unsigned long)((((u64)1 << NSEC_JIFFIE_SC) +  TICK_NSEC -1) / (u64)TICK_NSEC))
 #define USEC_CONVERSION   ((unsigned long)((((u64)NSEC_PER_USEC << USEC_JIFFIE_SC) +  TICK_NSEC -1) / (u64)TICK_NSEC))
 #define USEC_ROUND (u64)(((u64)1 << USEC_JIFFIE_SC) - 1)
 #if BITS_PER_LONG < 64
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define MAX_SEC_IN_JIFFIES   (long)((u64)((u64)MAX_JIFFY_OFFSET * TICK_NSEC) / NSEC_PER_SEC)
 #else
 #define MAX_SEC_IN_JIFFIES   (SH_DIV((MAX_JIFFY_OFFSET >> SEC_JIFFIE_SC) * TICK_NSEC, NSEC_PER_SEC, 1) - 1)
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #if HZ <= (MSEC_PER_SEC && !(MSEC_PER_SEC % HZ))
 #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
 #else
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #if HZ <= (USEC_PER_SEC && !(USEC_PER_SEC % HZ))
 #elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
 #else
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #if HZ <= (MSEC_PER_SEC && !(MSEC_PER_SEC % HZ))
 #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
 #else
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #if HZ <= (USEC_PER_SEC && !(USEC_PER_SEC % HZ))
 #elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
 #else
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #if TICK_NSEC % NSEC_PER_SEC / USER_HZ == 0
 #else
 #endif
 #if HZ % USER_HZ == 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #else
 #endif
 #if TICK_NSEC % NSEC_PER_SEC / USER_HZ == 0
 #else
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #if NSEC_PER_SEC % USER_HZ == 0
 #elif (USER_HZ % 512) == 0
 #else
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #endif