[PATCH] hrtimers: pass current time to hrtimer_forward()

Pass current time to hrtimer_forward().  This allows to use the softirq time
in the timer base when the forward function is called from the timer callback.
 Other places pass current time with a call to timer->base->get_time().
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/hrtimer.h

@@ -130,7 +130,8 @@ static inline int hrtimer_active(const struct hrtimer *timer)
 }
 
 /* Forward a hrtimer so it expires after now: */
-extern unsigned long hrtimer_forward(struct hrtimer *timer, ktime_t interval);
+extern unsigned long
+hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
 
 /* Precise sleep: */
 extern long hrtimer_nanosleep(struct timespec *rqtp,

kernel/hrtimer.c

@@ -301,18 +301,17 @@ void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
  * hrtimer_forward - forward the timer expiry
  *
  * @timer:	hrtimer to forward
+ * @now:	forward past this time
  * @interval:	the interval to forward
  *
  * Forward the timer expiry so it will expire in the future.
  * Returns the number of overruns.
  */
 unsigned long
-hrtimer_forward(struct hrtimer *timer, ktime_t interval)
+hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
 {
 	unsigned long orun = 1;
-	ktime_t delta, now;
-
-	now = timer->base->get_time();
+	ktime_t delta;
 
 	delta = ktime_sub(now, timer->expires);
 

kernel/itimer.c

@@ -136,6 +136,7 @@ int it_real_fn(void *data)
 
 	if (tsk->signal->it_real_incr.tv64 != 0) {
 		hrtimer_forward(&tsk->signal->real_timer,
+				tsk->signal->real_timer.base->softirq_time,
 				tsk->signal->it_real_incr);
 
 		return HRTIMER_RESTART;

kernel/posix-timers.c

@@ -251,15 +251,18 @@ __initcall(init_posix_timers);
 
 static void schedule_next_timer(struct k_itimer *timr)
 {
+	struct hrtimer *timer = &timr->it.real.timer;
+
 	if (timr->it.real.interval.tv64 == 0)
 		return;
 
-	timr->it_overrun += hrtimer_forward(&timr->it.real.timer,
+	timr->it_overrun += hrtimer_forward(timer, timer->base->get_time(),
 					    timr->it.real.interval);
+
 	timr->it_overrun_last = timr->it_overrun;
 	timr->it_overrun = -1;
 	++timr->it_requeue_pending;
-	hrtimer_restart(&timr->it.real.timer);
+	hrtimer_restart(timer);
 }
 
 /*
@@ -334,6 +337,7 @@ EXPORT_SYMBOL_GPL(posix_timer_event);
 static int posix_timer_fn(void *data)
 {
 	struct k_itimer *timr = data;
+	struct hrtimer *timer = &timr->it.real.timer;
 	unsigned long flags;
 	int si_private = 0;
 	int ret = HRTIMER_NORESTART;
@@ -351,7 +355,8 @@ static int posix_timer_fn(void *data)
 		 */
 		if (timr->it.real.interval.tv64 != 0) {
 			timr->it_overrun +=
-				hrtimer_forward(&timr->it.real.timer,
+				hrtimer_forward(timer,
+						timer->base->softirq_time,
 						timr->it.real.interval);
 			ret = HRTIMER_RESTART;
 			++timr->it_requeue_pending;
@@ -623,7 +628,8 @@ common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
 	if (timr->it_requeue_pending & REQUEUE_PENDING ||
 	    (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) {
 		timr->it_overrun +=
-			hrtimer_forward(timer, timr->it.real.interval);
+			hrtimer_forward(timer, timer->base->get_time(),
+					timr->it.real.interval);
 		remaining = hrtimer_get_remaining(timer);
 	}
  calci: