compatible layer

src/Kconfig

@@ -443,6 +443,14 @@ config RT_USING_SCHED_THREAD_CTX
         mandatory option in the future.
     default y if RT_USING_SMP
 
+config RT_USING_ABSTRACT_THREAD_SELF
+    bool "Using the abstract version of thread self"
+    depends on !RT_USING_SMP
+    help
+        Using the rt_thread_self() to get TCB instead of fetching from
+        global object rt_current_thread to achieve better maintainability
+    default n
+
 config RT_USING_CONSOLE
     bool "Using console for rt_kprintf"
     default y

src/cpu_up.c

@@ -12,7 +12,13 @@
 #include <rthw.h>
 #include <rtthread.h>
 
-static struct rt_cpu _cpu;
+#ifndef RT_USING_ABSTRACT_THREAD_SELF
+#undef rt_current_thread
+#define _cpu rt_current_thread
+/* regarding to the legacy codes */
+#endif /* RT_USING_ABSTRACT_THREAD_SELF */
+
+struct rt_cpu _cpu;
 
 /**
  * @brief   Initialize a static spinlock object.