[Qemu-devel] qemu_rearm_alarm_timer: do not call rearm if the next deadline is INT64_MAX

[Stefano Stabellini]

qemu_rearm_alarm_timer partially duplicates the code in
qemu_next_alarm_deadline to figure out if it needs to rearm the timer.
If it calls qemu_next_alarm_deadline, it always rearms the timer even if
the next deadline is INT64_MAX.

This patch simplifies the behavior of qemu_rearm_alarm_timer and removes
the duplicated code, always calling qemu_next_alarm_deadline and only
rearming the timer if the deadline is less than INT64_MAX.

Signed-off-by: Stefano Stabellini <address@hidden>

diff --git a/qemu-timer.c b/qemu-timer.c
index de98977..81ff824 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -112,14 +112,10 @@ static int64_t qemu_next_alarm_deadline(void)
 
 static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
 {
-    int64_t nearest_delta_ns;
-    if (!rt_clock->active_timers &&
-        !vm_clock->active_timers &&
-        !host_clock->active_timers) {
-        return;
+    int64_t nearest_delta_ns = qemu_next_alarm_deadline();
+    if (nearest_delta_ns < INT64_MAX) {
+        t->rearm(t, nearest_delta_ns);
     }
-    nearest_delta_ns = qemu_next_alarm_deadline();
-    t->rearm(t, nearest_delta_ns);
 }
 
 /* TODO: MIN_TIMER_REARM_NS should be optimized */