score: PR1782: CPU_USE_DEFERRED_FP_SWITCH

Do not redefine CPU_USE_DEFERRED_FP_SWITCH.

cpukit/score/cpu/i386/rtems/score/cpu.h

@@ -93,7 +93,11 @@ extern "C" {
 
 #define CPU_ALL_TASKS_ARE_FP             FALSE
 #define CPU_IDLE_TASK_IS_FP              FALSE
-#define CPU_USE_DEFERRED_FP_SWITCH       TRUE
+#if defined(RTEMS_SMP)
+  #define CPU_USE_DEFERRED_FP_SWITCH     FALSE
+#else
+  #define CPU_USE_DEFERRED_FP_SWITCH     TRUE
+#endif
 #endif /* __SSE__ */
 
 #define CPU_STACK_GROWS_UP               FALSE

cpukit/score/cpu/sparc/rtems/score/cpu.h

@@ -168,7 +168,11 @@ extern "C" {
  * On the SPARC, we can disable the FPU for integer only tasks so
  * it is safe to defer floating point context switches.
  */
-#define CPU_USE_DEFERRED_FP_SWITCH       TRUE
+#if defined(RTEMS_SMP)
+  #define CPU_USE_DEFERRED_FP_SWITCH FALSE
+#else
+  #define CPU_USE_DEFERRED_FP_SWITCH TRUE
+#endif
 
 /**
  * Does this port provide a CPU dependent IDLE task implementation?

cpukit/score/include/rtems/score/percpu.h

@@ -55,6 +55,10 @@ typedef struct Thread_Control_struct Thread_Control;
 
 #ifdef RTEMS_SMP
 
+#if CPU_USE_DEFERRED_FP_SWITCH == TRUE
+  #error "deferred FP switch not implemented for SMP"
+#endif
+
 typedef enum {
   /**
    * @brief The per CPU controls are initialized to zero.

cpukit/score/include/rtems/score/thread.h

@@ -50,15 +50,6 @@
   #define RTEMS_SCORE_THREAD_ENABLE_USER_PROVIDED_STACK_VIA_API
 #endif
 
-/*
- *  Deferred floating point context switches are not currently
- *  supported when in SMP configuration.
- */
-#if defined(RTEMS_SMP)
-  #undef  CPU_USE_DEFERRED_FP_SWITCH
-  #define CPU_USE_DEFERRED_FP_SWITCH FALSE
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif