sched/sched: Correct the elapsed time calculation.

This patch addresses an issue where the elapsed time was uncorrectly calculated.

Signed-off-by: ouyangxiangzhen <[email protected]>
Signed-off-by: ligd <[email protected]>

Author: Fix-Point

sched/sched/sched_timerexpiration.c

@@ -562,31 +562,20 @@ void nxsched_reassess_timer(void)
   clock_t ticks;
   clock_t elapsed;
 
-#ifdef CONFIG_SCHED_TICKLESS_ALARM
-  /* Cancel the alarm and get the current time */
+  /* Cancel the timer and get the current time */
 
+#ifdef CONFIG_SCHED_TICKLESS_ALARM
   up_alarm_tick_cancel(&ticks);
-
-  /* Convert this to the elapsed time and update clock tickbase */
-
-  elapsed = ticks - g_timer_tick;
-  g_timer_tick = ticks;
 #else
-  /* Cancel the timer and get the current time */
-
   up_timer_gettick(&ticks);
   up_timer_tick_cancel(&elapsed);
   DEBUGASSERT(elapsed <= g_timer_interval);
+#endif
 
-  /* Handle the partial timer.  This will reassess all timer conditions and
-   * re-start the interval timer with the correct delay.  Context switches
-   * are not permitted in this case because we are not certain of the
-   * calling conditions.
-   */
+  /* Convert this to the elapsed time and update clock tickbase */
 
-  ticks += g_timer_interval - elapsed;
+  elapsed = ticks - g_timer_tick;
   g_timer_tick = ticks;
-#endif
 
   /* Process the timer ticks and start next timer */