Code review suggestions

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

Author: aggarg

portable/GCC/ARM_AARCH64/port.c

@@ -468,15 +468,19 @@ void FreeRTOS_Tick_Handler( void )
 }
 /*-----------------------------------------------------------*/
 
-void vPortTaskUsesFPU( void )
-{
-    /* A task is registering the fact that it needs an FPU context.  Set the
-     * FPU flag (which is saved as part of the task context). */
-    ullPortTaskHasFPUContext = pdTRUE;
+#if ( configUSE_TASK_FPU_SUPPORT != 2 )
 
-    /* Consider initialising the FPSR here - but probably not necessary in
-     * AArch64. */
-}
+    void vPortTaskUsesFPU( void )
+    {
+        /* A task is registering the fact that it needs an FPU context.  Set the
+         * FPU flag (which is saved as part of the task context). */
+        ullPortTaskHasFPUContext = pdTRUE;
+
+        /* Consider initialising the FPSR here - but probably not necessary in
+         * AArch64. */
+    }
+
+#endif /* configUSE_TASK_FPU_SUPPORT */
 /*-----------------------------------------------------------*/
 
 void vPortClearInterruptMask( UBaseType_t uxNewMaskValue )

portable/GCC/ARM_AARCH64/portmacro.h

@@ -135,9 +135,18 @@ extern void vPortInstallFreeRTOSVectorTable( void );
  * handler for whichever peripheral is used to generate the RTOS tick. */
 void FreeRTOS_Tick_Handler( void );
 
-/* Any task that uses the floating point unit MUST call vPortTaskUsesFPU()
- * before any floating point instructions are executed. */
-void vPortTaskUsesFPU( void );
+/* If configUSE_TASK_FPU_SUPPORT is set to 1 (or left undefined) then tasks are
+ * created without an FPU context and must call vPortTaskUsesFPU() to give
+ * themselves an FPU context before using any FPU instructions.  If
+ * configUSE_TASK_FPU_SUPPORT is set to 2 then all tasks will have an FPU context
+ * by default. */
+#if ( configUSE_TASK_FPU_SUPPORT != 2 )
+    void vPortTaskUsesFPU( void );
+#else
+    /* Each task has an FPU context already, so define this function away to
+     * nothing to prevent it from being called accidentally. */
+    #define vPortTaskUsesFPU()
+#endif
 #define portTASK_USES_FLOATING_POINT()    vPortTaskUsesFPU()
 
 #define portLOWEST_INTERRUPT_PRIORITY           ( ( ( uint32_t ) configUNIQUE_INTERRUPT_PRIORITIES ) - 1UL )