[PATCH 4/9] posix timer overrun handling

[Roman Zippel]

This slightly changes the overrun handling. Instead of initially initializing
setting the overrun count to -1 it's set to 0 now and the extra overrun is
removed at timer restart time.

This has the two advantages, that the return value of timer_getoverrun()
doesn't overlap with the error values and si_overrun and it_overrun_last are
changed at the same time (and could be merged later).

Signed-off-by: Roman Zippel <zippel@xxxxxxxxxxxxxx>

---

 kernel/posix-timers.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

Index: linux-2.6-mm/kernel/posix-timers.c
===================================================================
--- linux-2.6-mm.orig/kernel/posix-timers.c	2005-11-28 22:31:03.000000000 +0100
+++ linux-2.6-mm/kernel/posix-timers.c	2005-11-28 22:31:06.000000000 +0100
@@ -371,8 +371,7 @@ static int schedule_next_timer(struct k_
 	} else {
 		posix_bump_timer(timr, now);
 	}
-	timr->it_overrun_last = timr->it_overrun;
-	timr->it_overrun = -1;
+	timr->it_overrun--;
 	return 1;
 }
 
@@ -401,14 +400,16 @@ void do_schedule_next_timer(struct sigin
 		if (timr->it_requeue_pending != info->si_sys_private)
 			goto exit;
 		posix_cpu_timer_schedule(timr);
+		info->si_overrun = timr->it_overrun_last;
 	} else {
 		BUG_ON(!timr->it_requeue_pending);
 		if (timr->it_requeue_pending > 1 &&
 		    schedule_next_timer(timr))
 			ptimer_start(&timr->it.real.timer);
 		timr->it_requeue_pending = 0;
+		info->si_overrun = timr->it_overrun_last = timr->it_overrun;
+		timr->it_overrun = 0;
 	}
-	info->si_overrun = timr->it_overrun_last;
 exit:
 	unlock_timer(timr, flags);
 }
@@ -621,7 +622,6 @@ sys_timer_create(clockid_t which_clock,
 	it_id_set = IT_ID_SET;
 	new_timer->it_id = (timer_t) new_timer_id;
 	new_timer->it_clock = which_clock;
-	new_timer->it_overrun = -1;
 	error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
 	if (error)
 		goto out;
@@ -974,8 +974,7 @@ common_timer_set(struct k_itimer *timr, 
 
 	if (timr->it_requeue_pending)
 		timr->it_requeue_pending = 1;
-	timr->it_overrun_last = 0;
-	timr->it_overrun = -1;
+	timr->it_overrun = 0;
 	/*
 	 *switch off the timer when it_value is zero
 	 */
-
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