diff --git a/libc/kernel/arch-x86/asm/pda.h b/libc/kernel/arch-x86/asm/pda.h
index 6711224..a105f28 100644
--- a/libc/kernel/arch-x86/asm/pda.h
+++ b/libc/kernel/arch-x86/asm/pda.h
@@ -7,59 +7,65 @@
  ***   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 X86_64_PDA_H
 #define X86_64_PDA_H
-
 #ifndef __ASSEMBLY__
 #include <linux/stddef.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/types.h>
 #include <linux/cache.h>
 #include <asm/page.h>
-
 struct x8664_pda {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  struct task_struct *pcurrent;
  unsigned long data_offset;
  unsigned long kernelstack;
  unsigned long oldrsp;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int irqcount;
  int cpunumber;
  char *irqstackptr;
  int nodenumber;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned int __softirq_pending;
  unsigned int __nmi_count;
  short mmu_state;
  short isidle;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  struct mm_struct *active_mm;
  unsigned apic_timer_irqs;
  unsigned irq0_irqs;
  unsigned irq_resched_count;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned irq_call_count;
  unsigned irq_tlb_count;
  unsigned irq_thermal_count;
  unsigned irq_threshold_count;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned irq_spurious_count;
 } ____cacheline_aligned_in_smp;
-
 #define cpu_pda(i) (_cpu_pda[i])
-
 #define pda_offset(field) offsetof(struct x8664_pda, field)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define pda_to_op(op,field,val) do {   typedef typeof(_proxy_pda.field) T__;   if (0) { T__ tmp__; tmp__ = (val); }     switch (sizeof(_proxy_pda.field)) {   case 2:   asm(op "w %1,%%gs:%c2" :   "+m" (_proxy_pda.field) :   "ri" ((T__)val),   "i"(pda_offset(field)));   break;   case 4:   asm(op "l %1,%%gs:%c2" :   "+m" (_proxy_pda.field) :   "ri" ((T__)val),   "i" (pda_offset(field)));   break;   case 8:   asm(op "q %1,%%gs:%c2":   "+m" (_proxy_pda.field) :   "ri" ((T__)val),   "i"(pda_offset(field)));   break;   default:   __bad_pda_field();   }   } while (0)
-
 #define pda_from_op(op,field) ({   typeof(_proxy_pda.field) ret__;   switch (sizeof(_proxy_pda.field)) {   case 2:   asm(op "w %%gs:%c1,%0" :   "=r" (ret__) :   "i" (pda_offset(field)),   "m" (_proxy_pda.field));   break;   case 4:   asm(op "l %%gs:%c1,%0":   "=r" (ret__):   "i" (pda_offset(field)),   "m" (_proxy_pda.field));   break;   case 8:   asm(op "q %%gs:%c1,%0":   "=r" (ret__) :   "i" (pda_offset(field)),   "m" (_proxy_pda.field));   break;   default:   __bad_pda_field();   }   ret__; })
-
 #define read_pda(field) pda_from_op("mov",field)
 #define write_pda(field,val) pda_to_op("mov",field,val)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define add_pda(field,val) pda_to_op("add",field,val)
 #define sub_pda(field,val) pda_to_op("sub",field,val)
 #define or_pda(field,val) pda_to_op("or",field,val)
-
 #define test_and_clear_bit_pda(bit,field) ({   int old__;   asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0"   : "=r" (old__), "+m" (_proxy_pda.field)   : "dIr" (bit), "i" (pda_offset(field)) : "memory");   old__;  })
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #define PDA_STACKOFFSET (5*8)
-
 #endif