staging: android-alarm: Fix namespace collision with upstreamed alarmtimers

The upstreamed alarmtimers are similar but not quite 100% API
compatibile with the android in-kernel alarm api. To aid the
transition, prefix the the android in-kernel api with android_

CC: Arve Hjønnevåg <arve@android.com>
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>

drivers/staging/android/alarm-dev.c

@@ -55,7 +55,7 @@ static uint32_t alarm_pending;
 static uint32_t alarm_enabled;
 static uint32_t wait_pending;
 
-static struct alarm alarms[ANDROID_ALARM_TYPE_COUNT];
+static struct android_alarm alarms[ANDROID_ALARM_TYPE_COUNT];
 
 static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
@@ -90,7 +90,7 @@ static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case ANDROID_ALARM_CLEAR(0):
 		spin_lock_irqsave(&alarm_slock, flags);
 		pr_alarm(IO, "alarm %d clear\n", alarm_type);
-		alarm_try_to_cancel(&alarms[alarm_type]);
+		android_alarm_try_to_cancel(&alarms[alarm_type]);
 		if (alarm_pending) {
 			alarm_pending &= ~alarm_type_mask;
 			if (!alarm_pending && !wait_pending)
@@ -121,7 +121,7 @@ static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		pr_alarm(IO, "alarm %d set %ld.%09ld\n", alarm_type,
 			new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
 		alarm_enabled |= alarm_type_mask;
-		alarm_start_range(&alarms[alarm_type],
+		android_alarm_start_range(&alarms[alarm_type],
 			timespec_to_ktime(new_alarm_time),
 			timespec_to_ktime(new_alarm_time));
 		spin_unlock_irqrestore(&alarm_slock, flags);
@@ -152,7 +152,7 @@ static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 			rv = -EFAULT;
 			goto err1;
 		}
-		rv = alarm_set_rtc(new_rtc_time);
+		rv = android_alarm_set_rtc(new_rtc_time);
 		spin_lock_irqsave(&alarm_slock, flags);
 		alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
 		wake_up(&alarm_wait_queue);
@@ -213,7 +213,7 @@ static int alarm_release(struct inode *inode, struct file *file)
 				alarm_enabled &= ~alarm_type_mask;
 			}
 			spin_unlock_irqrestore(&alarm_slock, flags);
-			alarm_cancel(&alarms[i]);
+			android_alarm_cancel(&alarms[i]);
 			spin_lock_irqsave(&alarm_slock, flags);
 		}
 		if (alarm_pending | wait_pending) {
@@ -230,7 +230,7 @@ static int alarm_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
-static void alarm_triggered(struct alarm *alarm)
+static void alarm_triggered(struct android_alarm *alarm)
 {
 	unsigned long flags;
 	uint32_t alarm_type_mask = 1U << alarm->type;
@@ -269,7 +269,7 @@ static int __init alarm_dev_init(void)
 		return err;
 
 	for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++)
-		alarm_init(&alarms[i], i, alarm_triggered);
+		android_alarm_init(&alarms[i], i, alarm_triggered);
 	wake_lock_init(&alarm_wake_lock, WAKE_LOCK_SUSPEND, "alarm");
 
 	return 0;

drivers/staging/android/alarm.c

@@ -70,7 +70,7 @@ static bool suspended;
 
 static void update_timer_locked(struct alarm_queue *base, bool head_removed)
 {
-	struct alarm *alarm;
+	struct android_alarm *alarm;
 	bool is_wakeup = base == &alarms[ANDROID_ALARM_RTC_WAKEUP] ||
 			base == &alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP];
 
@@ -85,7 +85,7 @@ static void update_timer_locked(struct alarm_queue *base, bool head_removed)
 	if (!base->first)
 		return;
 
-	alarm = container_of(base->first, struct alarm, node);
+	alarm = container_of(base->first, struct android_alarm, node);
 
 	pr_alarm(FLOW, "selected alarm, type %d, func %pF at %lld\n",
 		alarm->type, alarm->function, ktime_to_ns(alarm->expires));
@@ -102,12 +102,12 @@ static void update_timer_locked(struct alarm_queue *base, bool head_removed)
 	hrtimer_start_expires(&base->timer, HRTIMER_MODE_ABS);
 }
 
-static void alarm_enqueue_locked(struct alarm *alarm)
+static void alarm_enqueue_locked(struct android_alarm *alarm)
 {
 	struct alarm_queue *base = &alarms[alarm->type];
 	struct rb_node **link = &base->alarms.rb_node;
 	struct rb_node *parent = NULL;
-	struct alarm *entry;
+	struct android_alarm *entry;
 	int leftmost = 1;
 
 	pr_alarm(FLOW, "added alarm, type %d, func %pF at %lld\n",
@@ -122,7 +122,7 @@ static void alarm_enqueue_locked(struct alarm *alarm)
 
 	while (*link) {
 		parent = *link;
-		entry = rb_entry(parent, struct alarm, node);
+		entry = rb_entry(parent, struct android_alarm, node);
 		/*
 		* We dont care about collisions. Nodes with
 		* the same expiry time stay together.
@@ -144,13 +144,13 @@ static void alarm_enqueue_locked(struct alarm *alarm)
 }
 
 /**
- * alarm_init - initialize an alarm
+ * android_alarm_init - initialize an alarm
  * @alarm:	the alarm to be initialized
  * @type:	the alarm type to be used
  * @function:	alarm callback function
  */
-void alarm_init(struct alarm *alarm,
-	enum android_alarm_type type, void (*function)(struct alarm *))
+void android_alarm_init(struct android_alarm *alarm,
+	enum android_alarm_type type, void (*function)(struct android_alarm *))
 {
 	RB_CLEAR_NODE(&alarm->node);
 	alarm->type = type;
@@ -161,12 +161,13 @@ void alarm_init(struct alarm *alarm,
 
 
 /**
- * alarm_start_range - (re)start an alarm
+ * android_alarm_start_range - (re)start an alarm
  * @alarm:	the alarm to be added
  * @start:	earliest expiry time
  * @end:	expiry time
  */
-void alarm_start_range(struct alarm *alarm, ktime_t start, ktime_t end)
+void android_alarm_start_range(struct android_alarm *alarm, ktime_t start,
+								ktime_t end)
 {
 	unsigned long flags;
 
@@ -178,7 +179,7 @@ void alarm_start_range(struct alarm *alarm, ktime_t start, ktime_t end)
 }
 
 /**
- * alarm_try_to_cancel - try to deactivate an alarm
+ * android_alarm_try_to_cancel - try to deactivate an alarm
  * @alarm:	alarm to stop
  *
  * Returns:
@@ -187,7 +188,7 @@ void alarm_start_range(struct alarm *alarm, ktime_t start, ktime_t end)
  * -1 when the alarm may currently be excuting the callback function and
  *    cannot be stopped (it may also be inactive)
  */
-int alarm_try_to_cancel(struct alarm *alarm)
+int android_alarm_try_to_cancel(struct android_alarm *alarm)
 {
 	struct alarm_queue *base = &alarms[alarm->type];
 	unsigned long flags;
@@ -218,17 +219,17 @@ int alarm_try_to_cancel(struct alarm *alarm)
 }
 
 /**
- * alarm_cancel - cancel an alarm and wait for the handler to finish.
+ * android_alarm_cancel - cancel an alarm and wait for the handler to finish.
  * @alarm:	the alarm to be cancelled
  *
  * Returns:
  *  0 when the alarm was not active
  *  1 when the alarm was active
  */
-int alarm_cancel(struct alarm *alarm)
+int android_alarm_cancel(struct android_alarm *alarm)
 {
 	for (;;) {
-		int ret = alarm_try_to_cancel(alarm);
+		int ret = android_alarm_try_to_cancel(alarm);
 		if (ret >= 0)
 			return ret;
 		cpu_relax();
@@ -239,7 +240,7 @@ int alarm_cancel(struct alarm *alarm)
  * alarm_set_rtc - set the kernel and rtc walltime
  * @new_time:	timespec value containing the new time
  */
-int alarm_set_rtc(struct timespec new_time)
+int android_alarm_set_rtc(struct timespec new_time)
 {
 	int i;
 	int ret;
@@ -317,7 +318,7 @@ ktime_t alarm_get_elapsed_realtime(void)
 static enum hrtimer_restart alarm_timer_triggered(struct hrtimer *timer)
 {
 	struct alarm_queue *base;
-	struct alarm *alarm;
+	struct android_alarm *alarm;
 	unsigned long flags;
 	ktime_t now;
 
@@ -331,7 +332,7 @@ static enum hrtimer_restart alarm_timer_triggered(struct hrtimer *timer)
 		base - alarms, ktime_to_ns(now));
 
 	while (base->first) {
-		alarm = container_of(base->first, struct alarm, node);
+		alarm = container_of(base->first, struct android_alarm, node);
 		if (alarm->softexpires.tv64 > now.tv64) {
 			pr_alarm(FLOW, "don't call alarm, %pF, %lld (s %lld)\n",
 				alarm->function, ktime_to_ns(alarm->expires),

drivers/staging/android/android_alarm.h

@@ -57,23 +57,24 @@ enum android_alarm_type {
  *
  */
 
-struct alarm {
+struct android_alarm {
 	struct rb_node		node;
 	enum android_alarm_type type;
 	ktime_t			softexpires;
 	ktime_t			expires;
-	void			(*function)(struct alarm *);
+	void			(*function)(struct android_alarm *);
 };
 
-void alarm_init(struct alarm *alarm,
-	enum android_alarm_type type, void (*function)(struct alarm *));
-void alarm_start_range(struct alarm *alarm, ktime_t start, ktime_t end);
-int alarm_try_to_cancel(struct alarm *alarm);
-int alarm_cancel(struct alarm *alarm);
+void android_alarm_init(struct android_alarm *alarm,
+	enum android_alarm_type type, void (*function)(struct android_alarm *));
+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);
 
 /* set rtc while preserving elapsed realtime */
-int alarm_set_rtc(const struct timespec ts);
+int android_alarm_set_rtc(const struct timespec ts);
 
 #endif