diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 967689e97ec..dedb90c32ce 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -159,7 +159,7 @@
       <a href="#listmgmt">4.7.2 OS List Management APIs</a><br>
       <a href="#schedprocesstimer">4.7.3 <code>nxsched_process_timer()</code></a><br>
       <a href="#schedtimerexpiration">4.7.4 <code>nxsched_timer_expiration()</code></a><br>
-      <a href="#schedalarmexpiration">4.7.5 <code>sched_alarm_expiration()</code></a><br>
+      <a href="#schedalarmexpiration">4.7.5 <code>nxsched_alarm_expiration()</code></a><br>
       <a href="#irqdispatch">4.7.6 <code>irq_dispatch()</code></a>
     </ul>
     <a href="#internalOS">4.8 Application OS vs. Internal OS Interfaces</a><br>
@@ -2650,7 +2650,7 @@ config ARCH_SIM
 </p>
 <ul>
   <li>
-    <a href="#schedalarmexpiration"><code>sched_alarm_expiration()</code></a>. Called by the platform-specific logic when the alarm expires.
+    <a href="#schedalarmexpiration"><code>nxsched_alarm_expiration()</code></a>. Called by the platform-specific logic when the alarm expires.
   </li>
   <li>
     <a href="#schedtimerexpiration"><code>nxsched_timer_expiration()</code></a>. Called by the platform-specific logic when the interval time expires.
@@ -3983,7 +3983,7 @@ void nxsched_timer_expiration(void);
   Base code implementation assumes that this function is called from interrupt handling logic with interrupts disabled.
 </ul>
 
-<h3><a name="schedalarmexpiration">4.7.5 <code>sched_alarm_expiration()</code></a></h3>
+<h3><a name="schedalarmexpiration">4.7.5 <code>nxsched_alarm_expiration()</code></a></h3>
 <p><b>Function Prototype</b>:<p>
 <ul><pre>
 #include &lt;nuttx/arch.h&gt;
diff --git a/arch/arm/src/lpc43xx/lpc43_rit.c b/arch/arm/src/lpc43xx/lpc43_rit.c
index c39e4b7a383..b538cbbf0e1 100644
--- a/arch/arm/src/lpc43xx/lpc43_rit.c
+++ b/arch/arm/src/lpc43xx/lpc43_rit.c
@@ -101,7 +101,7 @@ static int lpc43_RIT_isr(int irq, FAR void *context, FAR void *arg)
 
       g_ts.tv_sec = (uint32_t)(internal_timer / 1000000000);
       g_ts.tv_nsec = (uint32_t)(internal_timer % 1000000000);
-      sched_alarm_expiration(&g_ts);
+      nxsched_alarm_expiration(&g_ts);
     }
 
   leave_critical_section(flags);
diff --git a/arch/arm/src/lpc43xx/lpc43_tickless_rit.c b/arch/arm/src/lpc43xx/lpc43_tickless_rit.c
index c029a9a0fab..17f657ee876 100644
--- a/arch/arm/src/lpc43xx/lpc43_tickless_rit.c
+++ b/arch/arm/src/lpc43xx/lpc43_tickless_rit.c
@@ -528,7 +528,7 @@ static inline void lpc43_tl_alarm(uint32_t curr)
 #ifdef CONFIG_SCHED_TICKLESS_ALARM
   struct timespec ts;
   up_timer_gettime(&ts);
-  sched_alarm_expiration(&ts);
+  nxsched_alarm_expiration(&ts);
 #else
   nxsched_timer_expiration();
 #endif
diff --git a/arch/arm/src/lpc54xx/lpc54_tickless.c b/arch/arm/src/lpc54xx/lpc54_tickless.c
index 62192dff97d..69ef5d2f301 100644
--- a/arch/arm/src/lpc54xx/lpc54_tickless.c
+++ b/arch/arm/src/lpc54xx/lpc54_tickless.c
@@ -558,7 +558,7 @@ static inline void lpc54_tl_alarm(uint64_t curr)
 #ifdef CONFIG_SCHED_TICKLESS_ALARM
   struct timespec ts;
   up_timer_gettime(&ts);
-  sched_alarm_expiration(&ts);
+  nxsched_alarm_expiration(&ts);
 #else
   nxsched_timer_expiration();
 #endif
diff --git a/drivers/timers/arch_alarm.c b/drivers/timers/arch_alarm.c
index d0ad56bfbd5..9f8d9535d8f 100644
--- a/drivers/timers/arch_alarm.c
+++ b/drivers/timers/arch_alarm.c
@@ -167,7 +167,7 @@ static void oneshot_callback(FAR struct oneshot_lowerhalf_s *lower,
 
 #ifdef CONFIG_SCHED_TICKLESS
   ONESHOT_CURRENT(g_oneshot_lower, &now);
-  sched_alarm_expiration(&now);
+  nxsched_alarm_expiration(&now);
 #else
   struct timespec delta;
 
@@ -306,7 +306,7 @@ int up_timer_gettime(FAR struct timespec *ts)
  * Description:
  *   Cancel the alarm and return the time of cancellation of the alarm.
  *   These two steps need to be as nearly atomic as possible.
- *   sched_alarm_expiration() will not be called unless the alarm is
+ *   nxsched_alarm_expiration() will not be called unless the alarm is
  *   restarted with up_alarm_start().
  *
  *   If, as a race condition, the alarm has already expired when this
@@ -353,14 +353,14 @@ int up_alarm_cancel(FAR struct timespec *ts)
  * Name: up_alarm_start
  *
  * Description:
- *   Start the alarm.  sched_alarm_expiration() will be called when the
+ *   Start the alarm.  nxsched_alarm_expiration() will be called when the
  *   alarm occurs (unless up_alaram_cancel is called to stop it).
  *
  *   Provided by platform-specific code and called from the RTOS base code.
  *
  * Input Parameters:
  *   ts - The time in the future at the alarm is expected to occur.  When
- *        the alarm occurs the timer logic will call sched_alarm_expiration().
+ *        the alarm occurs the timer logic will call nxsched_alarm_expiration().
  *
  * Returned Value:
  *   Zero (OK) is returned on success; a negated errno value is returned on
diff --git a/include/nuttx/arch.h b/include/nuttx/arch.h
index 0cc0e858b3c..49b8bc77cb9 100644
--- a/include/nuttx/arch.h
+++ b/include/nuttx/arch.h
@@ -1431,7 +1431,7 @@ int up_prioritize_irq(int irq, int priority);
  * specific interval timer implementation:
  *
  * #ifdef CONFIG_SCHED_TICKLESS_ALARM
- *   void sched_alarm_expiration(FAR const struct timespec *ts):  Called
+ *   void nxsched_alarm_expiration(FAR const struct timespec *ts):  Called
  *     by the platform-specific logic when the alarm expires.
  * #else
  *   void nxsched_timer_expiration(void):  Called by the platform-specific
@@ -1488,7 +1488,7 @@ void up_timer_getmask(FAR uint64_t *mask);
  * Description:
  *   Cancel the alarm and return the time of cancellation of the alarm.
  *   These two steps need to be as nearly atomic as possible.
- *   sched_alarm_expiration() will not be called unless the alarm is
+ *   nxsched_alarm_expiration() will not be called unless the alarm is
  *   restarted with up_alarm_start().
  *
  *   If, as a race condition, the alarm has already expired when this
@@ -1524,14 +1524,14 @@ int up_alarm_cancel(FAR struct timespec *ts);
  * Name: up_alarm_start
  *
  * Description:
- *   Start the alarm.  sched_alarm_expiration() will be called when the
+ *   Start the alarm.  nxsched_alarm_expiration() will be called when the
  *   alarm occurs (unless up_alaram_cancel is called to stop it).
  *
  *   Provided by platform-specific code and called from the RTOS base code.
  *
  * Input Parameters:
  *   ts - The time in the future at the alarm is expected to occur.  When
- *        the alarm occurs the timer logic will call sched_alarm_expiration().
+ *        the alarm occurs the timer logic will call nxsched_alarm_expiration().
  *
  * Returned Value:
  *   Zero (OK) is returned on success; a negated errno value is returned on
@@ -2030,7 +2030,7 @@ void nxsched_timer_expiration(void);
 #endif
 
 /****************************************************************************
- * Name:  sched_alarm_expiration
+ * Name:  nxsched_alarm_expiration
  *
  * Description:
  *   if CONFIG_SCHED_TICKLESS is defined, then this function is provided by
@@ -2050,7 +2050,7 @@ void nxsched_timer_expiration(void);
  ****************************************************************************/
 
 #if defined(CONFIG_SCHED_TICKLESS) && defined(CONFIG_SCHED_TICKLESS_ALARM)
-void sched_alarm_expiration(FAR const struct timespec *ts);
+void nxsched_alarm_expiration(FAR const struct timespec *ts);
 #endif
 
 /****************************************************************************
diff --git a/sched/sched/sched_timerexpiration.c b/sched/sched/sched_timerexpiration.c
index 4a0a13b432d..c60f98062eb 100644
--- a/sched/sched/sched_timerexpiration.c
+++ b/sched/sched/sched_timerexpiration.c
@@ -465,7 +465,7 @@ static void nxsched_timer_start(unsigned int ticks)
  ****************************************************************************/
 
 /****************************************************************************
- * Name:  sched_alarm_expiration
+ * Name:  nxsched_alarm_expiration
  *
  * Description:
  *   if CONFIG_SCHED_TICKLESS is defined, then this function is provided by
@@ -485,7 +485,7 @@ static void nxsched_timer_start(unsigned int ticks)
  ****************************************************************************/
 
 #ifdef CONFIG_SCHED_TICKLESS_ALARM
-void sched_alarm_expiration(FAR const struct timespec *ts)
+void nxsched_alarm_expiration(FAR const struct timespec *ts)
 {
   unsigned int elapsed;
   unsigned int nexttime;