Backs out part of commit d7a602e9b2. When CONFIG_SCHED_CPULOAD_EXTCLK is defined, the prototype must still be available in nuttx/arch.h

include/nuttx/arch.h

@@ -2053,6 +2053,31 @@ void sched_timer_expiration(void);
 void sched_alarm_expiration(FAR const struct timespec *ts);
 #endif
 
+/****************************************************************************
+ * Name: nxsched_process_cpuload
+ *
+ * Description:
+ *   Collect data that can be used for CPU load measurements.  When
+ *   CONFIG_SCHED_CPULOAD_EXTCLK is defined, this is an exported interface,
+ *   use the the external clock logic.  Otherwise, it is an OS Internal
+ *   interface.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ * Assumptions/Limitations:
+ *   This function is called from a timer interrupt handler with all
+ *   interrupts disabled.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_SCHED_CPULOAD) && defined(CONFIG_SCHED_CPULOAD_EXTCLK)
+void weak_function nxsched_process_cpuload(void);
+#endif
+
 /****************************************************************************
  * Name: irq_dispatch
  *

sched/sched/sched_cpuload.c

@@ -154,7 +154,10 @@ static inline void nxsched_cpu_process_cpuload(int cpu)
  * Name: nxsched_process_cpuload
  *
  * Description:
- *   Collect data that can be used for CPU load measurements.
+ *   Collect data that can be used for CPU load measurements.  When
+ *   CONFIG_SCHED_CPULOAD_EXTCLK is defined, this is an exported interface,
+ *   use the the external clock logic.  Otherwise, it is an OS Internal
+ *   interface.
  *
  * Input Parameters:
  *   None