staging: android-alarm: Convert ALARM_ELAPSED_REALTIME to use CLOCK_BOOTTIME

The ALARM_ELAPSED_REALTIME clock domain in Android pointed
to the need for something similar in linux system-wide
(instead of limited to just the alarm interface).

Thus CLOCK_BOOTTIME was introduced into the upstream kernel
in 2.6.39.

This patch attempts to convert the android alarm timer to utilize
the kernel's CLOCK_BOOTTIME clockid for ALARM_ELAPSED_REALTIME,
instead of managing it itself.

CC: Colin Cross <ccross@android.com>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Android Kernel Team <kernel-team@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/staging/android/android_alarm.h b/drivers/staging/android/android_alarm.h
index e586caef4ba8..a1121772bc2e 100644
--- a/drivers/staging/android/android_alarm.h
+++ b/drivers/staging/android/android_alarm.h
@@ -37,6 +37,7 @@ enum android_alarm_type {
 
 #include <linux/ktime.h>
 #include <linux/rbtree.h>
+#include <linux/hrtimer.h>
 
 /*
  * The alarm interface is similar to the hrtimer interface but adds support
@@ -71,7 +72,11 @@ void android_alarm_start_range(struct android_alarm *alarm, ktime_t start,
 								ktime_t end);
 int android_alarm_try_to_cancel(struct android_alarm *alarm);
 int android_alarm_cancel(struct android_alarm *alarm);
-ktime_t alarm_get_elapsed_realtime(void);
+
+static inline ktime_t alarm_get_elapsed_realtime(void)
+{
+	return ktime_get_boottime();
+}
 
 /* set rtc while preserving elapsed realtime */
 int android_alarm_set_rtc(const struct timespec ts);