diff --git a/libc/kernel/common/linux/hardirq.h b/libc/kernel/common/linux/hardirq.h
index c0566b0..90ad99b 100644
--- a/libc/kernel/common/linux/hardirq.h
+++ b/libc/kernel/common/linux/hardirq.h
@@ -7,67 +7,67 @@
  ***   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_HARDIRQ_H
 #define LINUX_HARDIRQ_H
-
 #include <linux/preempt.h>
 #include <linux/smp_lock.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/lockdep.h>
 #include <asm/hardirq.h>
 #include <asm/system.h>
-
 #define PREEMPT_BITS 8
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SOFTIRQ_BITS 8
-
 #ifndef HARDIRQ_BITS
 #define HARDIRQ_BITS 12
-
 #if 1 << HARDIRQ_BITS < NR_IRQS
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #error HARDIRQ_BITS is too low!
 #endif
 #endif
-
 #define PREEMPT_SHIFT 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
 #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
-
 #define __IRQ_MASK(x) ((1UL << (x))-1)
-
 #define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
 #define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
-
 #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
 #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
-
 #if PREEMPT_ACTIVE < 1 << HARDIRQ_SHIFT + HARDIRQ_BITS
 #error PREEMPT_ACTIVE is too low!
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
 #define softirq_count() (preempt_count() & SOFTIRQ_MASK)
 #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
-
 #define in_irq() (hardirq_count())
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define in_softirq() (softirq_count())
 #define in_interrupt() (irq_count())
-
 #define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
-
 #define preemptible() 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
-
 #define synchronize_irq(irq) barrier()
-
 struct task_struct;
-
 #define irq_enter()   do {   account_system_vtime(current);   add_preempt_count(HARDIRQ_OFFSET);   trace_hardirq_enter();   } while (0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __irq_exit()   do {   trace_hardirq_exit();   account_system_vtime(current);   sub_preempt_count(HARDIRQ_OFFSET);   } while (0)
-
 #define nmi_enter() do { lockdep_off(); irq_enter(); } while (0)
 #define nmi_exit() do { __irq_exit(); lockdep_on(); } while (0)
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */