diff --git a/libc/kernel/common/linux/cpumask.h b/libc/kernel/common/linux/cpumask.h
index 541940a..04cb839 100644
--- a/libc/kernel/common/linux/cpumask.h
+++ b/libc/kernel/common/linux/cpumask.h
@@ -7,81 +7,98 @@
  ***   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_CPUMASK_H
 #define __LINUX_CPUMASK_H
-
 #include <linux/kernel.h>
 #include <linux/threads.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/bitmap.h>
-
 typedef struct { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
-
 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
 #define cpus_andnot(dst, src1, src2)   __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpus_complement(dst, src) __cpus_complement(&(dst), &(src), NR_CPUS)
 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
 #define cpus_full(cpumask) __cpus_full(&(cpumask), NR_CPUS)
 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
 #define cpus_shift_right(dst, src, n)   __cpus_shift_right(&(dst), &(src), (n), NR_CPUS)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpus_shift_left(dst, src, n)   __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
 #define first_cpu(src) 0
 #define next_cpu(n, src) 1
 #define cpumask_of_cpu(cpu)  ({   typeof(_unused_cpumask_arg_) m;   if (sizeof(m) == sizeof(unsigned long)) {   m.bits[0] = 1UL<<(cpu);   } else {   cpus_clear(m);   cpu_set((cpu), m);   }   m;  })
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
 #if NR_CPUS <= BITS_PER_LONG
 #define CPU_MASK_ALL  (cpumask_t) { {   [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD  } }
 #else
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define CPU_MASK_ALL  (cpumask_t) { {   [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,   [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD  } }
 #endif
 #define CPU_MASK_NONE  (cpumask_t) { {   [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL  } }
 #define CPU_MASK_CPU0  (cpumask_t) { {   [0] = 1UL  } }
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpus_addr(src) ((src).bits)
 #define cpumask_scnprintf(buf, len, src)   __cpumask_scnprintf((buf), (len), &(src), NR_CPUS)
 #define cpumask_parse(ubuf, ulen, dst)   __cpumask_parse((ubuf), (ulen), &(dst), NR_CPUS)
 #define cpulist_scnprintf(buf, len, src)   __cpulist_scnprintf((buf), (len), &(src), NR_CPUS)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpulist_parse(buf, dst) __cpulist_parse((buf), &(dst), NR_CPUS)
 #define cpu_remap(oldbit, old, new)   __cpu_remap((oldbit), &(old), &(new), NR_CPUS)
 #define cpus_remap(dst, src, old, new)   __cpus_remap(&(dst), &(src), &(old), &(new), NR_CPUS)
 #if NR_CPUS > 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define for_each_cpu_mask(cpu, mask)   for ((cpu) = first_cpu(mask);   (cpu) < NR_CPUS;   (cpu) = next_cpu((cpu), (mask)))
 #else
 #define for_each_cpu_mask(cpu, mask)   for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #if NR_CPUS > 1
 #define num_online_cpus() cpus_weight(cpu_online_map)
 #define num_possible_cpus() cpus_weight(cpu_possible_map)
 #define num_present_cpus() cpus_weight(cpu_present_map)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpu_online(cpu) cpu_isset((cpu), cpu_online_map)
 #define cpu_possible(cpu) cpu_isset((cpu), cpu_possible_map)
 #define cpu_present(cpu) cpu_isset((cpu), cpu_present_map)
 #else
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define num_online_cpus() 1
 #define num_possible_cpus() 1
 #define num_present_cpus() 1
 #define cpu_online(cpu) ((cpu) == 0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpu_possible(cpu) ((cpu) == 0)
 #define cpu_present(cpu) ((cpu) == 0)
 #endif
-
 #define highest_possible_processor_id() 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define any_online_cpu(mask) 0
-
 #define for_each_possible_cpu(cpu) for_each_cpu_mask((cpu), cpu_possible_map)
 #define for_each_online_cpu(cpu) for_each_cpu_mask((cpu), cpu_online_map)
 #define for_each_present_cpu(cpu) for_each_cpu_mask((cpu), cpu_present_map)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif