diff --git a/libraries/AP_HAL_Empty/Scheduler.cpp b/libraries/AP_HAL_Empty/Scheduler.cpp
index bb57133e92..576c42ba9f 100644
--- a/libraries/AP_HAL_Empty/Scheduler.cpp
+++ b/libraries/AP_HAL_Empty/Scheduler.cpp
@@ -42,12 +42,6 @@ bool Scheduler::in_timerprocess() {
     return false;
 }
 
-void Scheduler::begin_atomic()
-{}
-
-void Scheduler::end_atomic()
-{}
-
 void Scheduler::system_initialized()
 {}
 
diff --git a/libraries/AP_HAL_Empty/Scheduler.h b/libraries/AP_HAL_Empty/Scheduler.h
index ab282a7bb5..8bd163f502 100644
--- a/libraries/AP_HAL_Empty/Scheduler.h
+++ b/libraries/AP_HAL_Empty/Scheduler.h
@@ -22,9 +22,6 @@ public:
 
     void     register_timer_failsafe(AP_HAL::Proc, uint32_t period_us);
 
-    void     begin_atomic();
-    void     end_atomic();
-
     void     system_initialized();
 
     void     reboot(bool hold_in_bootloader);
diff --git a/libraries/AP_HAL_FLYMAPLE/Scheduler.cpp b/libraries/AP_HAL_FLYMAPLE/Scheduler.cpp
index ac017aee26..2f1d165e42 100644
--- a/libraries/AP_HAL_FLYMAPLE/Scheduler.cpp
+++ b/libraries/AP_HAL_FLYMAPLE/Scheduler.cpp
@@ -165,16 +165,6 @@ void FLYMAPLEScheduler::_failsafe_timer_event()
         _failsafe();
 }
 
-void FLYMAPLEScheduler::begin_atomic()
-{
-    noInterrupts();
-}
-
-void FLYMAPLEScheduler::end_atomic()
-{
-    interrupts();
-}
-
 void FLYMAPLEScheduler::_run_timer_procs(bool called_from_isr) 
 {
     _in_timer_proc = true;
diff --git a/libraries/AP_HAL_FLYMAPLE/Scheduler.h b/libraries/AP_HAL_FLYMAPLE/Scheduler.h
index f5e25722c9..e8a79a4ed6 100644
--- a/libraries/AP_HAL_FLYMAPLE/Scheduler.h
+++ b/libraries/AP_HAL_FLYMAPLE/Scheduler.h
@@ -43,9 +43,6 @@ public:
 
     void     register_timer_failsafe(AP_HAL::Proc, uint32_t period_us);
 
-    void     begin_atomic();
-    void     end_atomic();
-
     void     system_initialized();
 
     void     reboot(bool hold_in_bootloader);
diff --git a/libraries/AP_HAL_Linux/Scheduler.cpp b/libraries/AP_HAL_Linux/Scheduler.cpp
index 020aacd491..078564627a 100644
--- a/libraries/AP_HAL_Linux/Scheduler.cpp
+++ b/libraries/AP_HAL_Linux/Scheduler.cpp
@@ -397,12 +397,6 @@ bool Scheduler::in_timerprocess()
     return _in_timer_proc;
 }
 
-void Scheduler::begin_atomic()
-{}
-
-void Scheduler::end_atomic()
-{}
-
 void Scheduler::_wait_all_threads()
 {
     int r = pthread_barrier_wait(&_initialized_barrier);
diff --git a/libraries/AP_HAL_Linux/Scheduler.h b/libraries/AP_HAL_Linux/Scheduler.h
index e71c48286e..ae9e471939 100644
--- a/libraries/AP_HAL_Linux/Scheduler.h
+++ b/libraries/AP_HAL_Linux/Scheduler.h
@@ -34,9 +34,6 @@ public:
 
     void     register_timer_failsafe(AP_HAL::Proc, uint32_t period_us);
 
-    void     begin_atomic();
-    void     end_atomic();
-
     void     system_initialized();
 
     void     reboot(bool hold_in_bootloader);