diff --git a/ndk/platforms/android-21/include/linux/android_alarm.h b/ndk/platforms/android-21/include/linux/android_alarm.h
deleted file mode 100644
index d0111b2aa..000000000
--- a/ndk/platforms/android-21/include/linux/android_alarm.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/****************************************************************************
- ****************************************************************************
- ***
- ***   This header was automatically generated from a Linux kernel header
- ***   of the same name, to make information necessary for userspace to
- ***   call into the kernel available to libc.  It contains only constants,
- ***   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 _UAPI_LINUX_ANDROID_ALARM_H
-#define _UAPI_LINUX_ANDROID_ALARM_H
-#include <linux/ioctl.h>
-#include <linux/time.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-enum android_alarm_type {
- ANDROID_ALARM_RTC_WAKEUP,
- ANDROID_ALARM_RTC,
- ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- ANDROID_ALARM_ELAPSED_REALTIME,
- ANDROID_ALARM_SYSTEMTIME,
- ANDROID_ALARM_TYPE_COUNT,
-};
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-enum android_alarm_return_flags {
- ANDROID_ALARM_RTC_WAKEUP_MASK = 1U << ANDROID_ALARM_RTC_WAKEUP,
- ANDROID_ALARM_RTC_MASK = 1U << ANDROID_ALARM_RTC,
- ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK =
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- 1U << ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
- ANDROID_ALARM_ELAPSED_REALTIME_MASK =
- 1U << ANDROID_ALARM_ELAPSED_REALTIME,
- ANDROID_ALARM_SYSTEMTIME_MASK = 1U << ANDROID_ALARM_SYSTEMTIME,
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- ANDROID_ALARM_TIME_CHANGE_MASK = 1U << 16
-};
-#define ANDROID_ALARM_CLEAR(type) _IO('a', 0 | ((type) << 4))
-#define ANDROID_ALARM_WAIT _IO('a', 1)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define ALARM_IOW(c, type, size) _IOW('a', (c) | ((type) << 4), size)
-#define ANDROID_ALARM_SET(type) ALARM_IOW(2, type, struct timespec)
-#define ANDROID_ALARM_SET_AND_WAIT(type) ALARM_IOW(3, type, struct timespec)
-#define ANDROID_ALARM_GET_TIME(type) ALARM_IOW(4, type, struct timespec)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define ANDROID_ALARM_SET_RTC _IOW('a', 5, struct timespec)
-#define ANDROID_ALARM_BASE_CMD(cmd) (cmd & ~(_IOC(0, 0, 0xf0, 0)))
-#define ANDROID_ALARM_IOCTL_TO_TYPE(cmd) (_IOC_NR(cmd) >> 4)
-#endif
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
diff --git a/ndk/platforms/android-9/include/linux/android_alarm.h b/ndk/platforms/android-9/include/linux/android_alarm.h
deleted file mode 100644
index 80828eab4..000000000
--- a/ndk/platforms/android-9/include/linux/android_alarm.h
+++ /dev/null
@@ -1,50 +0,0 @@
-/****************************************************************************
- ****************************************************************************
- ***
- ***   This header was automatically generated from a Linux kernel header
- ***   of the same name, to make information necessary for userspace to
- ***   call into the kernel available to libc.  It contains only constants,
- ***   structures, and macros generated from the original header, and thus,
- ***   contains no copyrightable information.
- ***
- ****************************************************************************
- ****************************************************************************/
-#ifndef _LINUX_ANDROID_ALARM_H
-#define _LINUX_ANDROID_ALARM_H
-
-#include <asm/ioctl.h>
-#include <linux/time.h>
-
-typedef enum {
-
- ANDROID_ALARM_RTC_WAKEUP,
- ANDROID_ALARM_RTC,
- ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
- ANDROID_ALARM_ELAPSED_REALTIME,
- ANDROID_ALARM_SYSTEMTIME,
-
- ANDROID_ALARM_TYPE_COUNT,
-
-} android_alarm_type_t;
-
-typedef enum {
- ANDROID_ALARM_RTC_WAKEUP_MASK = 1U << ANDROID_ALARM_RTC_WAKEUP,
- ANDROID_ALARM_RTC_MASK = 1U << ANDROID_ALARM_RTC,
- ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK = 1U << ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
- ANDROID_ALARM_ELAPSED_REALTIME_MASK = 1U << ANDROID_ALARM_ELAPSED_REALTIME,
- ANDROID_ALARM_SYSTEMTIME_MASK = 1U << ANDROID_ALARM_SYSTEMTIME,
- ANDROID_ALARM_TIME_CHANGE_MASK = 1U << 16
-} android_alarm_return_flags_t;
-
-#define ANDROID_ALARM_CLEAR(type) _IO('a', 0 | ((type) << 4)) 
-#define ANDROID_ALARM_WAIT _IO('a', 1) 
-#define ANDROID_ALARM_SET(type) _IOW('a', 2 | ((type) << 4), struct timespec) 
-#define ANDROID_ALARM_SET_AND_WAIT(type) _IOW('a', 3 | ((type) << 4), struct timespec)
-#define ANDROID_ALARM_GET_TIME(type) _IOW('a', 4 | ((type) << 4), struct timespec)
-#define ANDROID_ALARM_SET_RTC _IOW('a', 5, struct timespec)
-#define ANDROID_ALARM_SET_TIMEZONE _IOW('a', 6, struct timezone)
-
-#define ANDROID_ALARM_BASE_CMD(cmd) (cmd & ~(_IOC(0, 0, 0xf0, 0)))
-#define ANDROID_ALARM_IOCTL_TO_TYPE(cmd) (_IOC_NR(cmd) >> 4)
-
-#endif