diff --git a/arch/hc/src/common/up_blocktask.c b/arch/hc/src/common/up_blocktask.c
index 6891c64590..4d874d1761 100644
--- a/arch/hc/src/common/up_blocktask.c
+++ b/arch/hc/src/common/up_blocktask.c
@@ -76,7 +76,7 @@
 
 void up_block_task(struct tcb_s *tcb, tstate_t task_state)
 {
-  struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head;
+  struct tcb_s *rtcb = this_task();
   bool switch_needed;
 
   /* Verify that the context switch can be performed */
@@ -97,7 +97,7 @@ void up_block_task(struct tcb_s *tcb, tstate_t task_state)
 
   sched_addblocked(tcb, (tstate_t)task_state);
 
-  /* If there are any pending tasks, then add them to the g_readytorun
+  /* If there are any pending tasks, then add them to the ready-to-run
    * task list now
    */
 
@@ -125,10 +125,10 @@ void up_block_task(struct tcb_s *tcb, tstate_t task_state)
           up_savestate(rtcb->xcp.regs);
 
           /* Restore the exception context of the rtcb at the (new) head
-           * of the g_readytorun task list.
+           * of the ready-to-run task list.
            */
 
-          rtcb = (struct tcb_s*)g_readytorun.head;
+          rtcb = this_task();
 
           /* Reset scheduler parameters */
 
@@ -142,17 +142,17 @@ void up_block_task(struct tcb_s *tcb, tstate_t task_state)
         }
 
       /* Copy the user C context into the TCB at the (old) head of the
-       * g_readytorun Task list. if up_saveusercontext returns a non-zero
+       * ready-to-run Task list. if up_saveusercontext returns a non-zero
        * value, then this is really the previously running task restarting!
        */
 
       else if (!up_saveusercontext(rtcb->xcp.regs))
         {
           /* Restore the exception context of the rtcb at the (new) head
-           * of the g_readytorun task list.
+           * of the ready-to-run task list.
            */
 
-          rtcb = (struct tcb_s*)g_readytorun.head;
+          rtcb = this_task();
 
 #ifdef CONFIG_ARCH_ADDRENV
          /* Make sure that the address environment for the previously
diff --git a/arch/hc/src/common/up_exit.c b/arch/hc/src/common/up_exit.c
index 0ec462e7e3..1ca43052c6 100644
--- a/arch/hc/src/common/up_exit.c
+++ b/arch/hc/src/common/up_exit.c
@@ -146,7 +146,7 @@ void _exit(int status)
 
   (void)irqsave();
 
-  slldbg("TCB=%p exiting\n", g_readytorun.head);
+  slldbg("TCB=%p exiting\n", this_task());
 
 #if defined(CONFIG_DUMP_ON_EXIT) && defined(CONFIG_DEBUG)
   slldbg("Other tasks:\n");
@@ -161,7 +161,7 @@ void _exit(int status)
    * head of the list.
    */
 
-  tcb = (struct tcb_s*)g_readytorun.head;
+  tcb = this_task();
 
 #ifdef CONFIG_ARCH_ADDRENV
   /* Make sure that the address environment for the previously running
diff --git a/arch/hc/src/common/up_releasepending.c b/arch/hc/src/common/up_releasepending.c
index 147088ab57..2d6c115e99 100644
--- a/arch/hc/src/common/up_releasepending.c
+++ b/arch/hc/src/common/up_releasepending.c
@@ -64,11 +64,11 @@
 
 void up_release_pending(void)
 {
-  struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head;
+  struct tcb_s *rtcb = this_task();
 
   slldbg("From TCB=%p\n", rtcb);
 
-  /* Merge the g_pendingtasks list into the g_readytorun task list */
+  /* Merge the g_pendingtasks list into the ready-to-run task list */
 
   /* sched_lock(); */
   if (sched_mergepending())
@@ -92,10 +92,10 @@ void up_release_pending(void)
            up_savestate(rtcb->xcp.regs);
 
           /* Restore the exception context of the rtcb at the (new) head
-           * of the g_readytorun task list.
+           * of the ready-to-run task list.
            */
 
-          rtcb = (struct tcb_s*)g_readytorun.head;
+          rtcb = this_task();
 
           /* Update scheduler parameters */
 
@@ -117,10 +117,10 @@ void up_release_pending(void)
       else if (!up_saveusercontext(rtcb->xcp.regs))
         {
           /* Restore the exception context of the rtcb at the (new) head
-           * of the g_readytorun task list.
+           * of the ready-to-run task list.
            */
 
-          rtcb = (struct tcb_s*)g_readytorun.head;
+          rtcb = this_task();
 
 #ifdef CONFIG_ARCH_ADDRENV
           /* Make sure that the address environment for the previously
diff --git a/arch/hc/src/common/up_reprioritizertr.c b/arch/hc/src/common/up_reprioritizertr.c
index 28dec0951d..261e1becd2 100644
--- a/arch/hc/src/common/up_reprioritizertr.c
+++ b/arch/hc/src/common/up_reprioritizertr.c
@@ -92,7 +92,7 @@ void up_reprioritize_rtr(struct tcb_s *tcb, uint8_t priority)
     }
   else
     {
-      struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head;
+      struct tcb_s *rtcb = this_task();
       bool switch_needed;
 
       slldbg("TCB=%p PRI=%d\n", tcb, priority);
@@ -147,10 +147,10 @@ void up_reprioritize_rtr(struct tcb_s *tcb, uint8_t priority)
                up_savestate(rtcb->xcp.regs);
 
               /* Restore the exception context of the rtcb at the (new) head
-               * of the g_readytorun task list.
+               * of the ready-to-run task list.
                */
 
-              rtcb = (struct tcb_s*)g_readytorun.head;
+              rtcb = this_task();
 
               /* Update scheduler parameters */
 
@@ -164,17 +164,17 @@ void up_reprioritize_rtr(struct tcb_s *tcb, uint8_t priority)
             }
 
           /* Copy the exception context into the TCB at the (old) head of the
-           * g_readytorun Task list. if up_saveusercontext returns a non-zero
+           * ready-to-run Task list. if up_saveusercontext returns a non-zero
            * value, then this is really the previously running task restarting!
            */
 
           else if (!up_saveusercontext(rtcb->xcp.regs))
             {
               /* Restore the exception context of the rtcb at the (new) head
-               * of the g_readytorun task list.
+               * of the ready-to-run task list.
                */
 
-              rtcb = (struct tcb_s*)g_readytorun.head;
+              rtcb = this_task();
 
 #ifdef CONFIG_ARCH_ADDRENV
               /* Make sure that the address environment for the previously
diff --git a/arch/hc/src/common/up_unblocktask.c b/arch/hc/src/common/up_unblocktask.c
index 034c9f2f81..fd32a1e307 100644
--- a/arch/hc/src/common/up_unblocktask.c
+++ b/arch/hc/src/common/up_unblocktask.c
@@ -71,7 +71,7 @@
 
 void up_unblock_task(struct tcb_s *tcb)
 {
-  struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head;
+  struct tcb_s *rtcb = this_task();
 
   /* Verify that the context switch can be performed */
 
@@ -83,7 +83,7 @@ void up_unblock_task(struct tcb_s *tcb)
   sched_removeblocked(tcb);
 
   /* Add the task in the correct location in the prioritized
-   * g_readytorun task list
+   * ready-to-run task list
    */
 
   if (sched_addreadytorun(tcb))
@@ -107,10 +107,10 @@ void up_unblock_task(struct tcb_s *tcb)
           up_savestate(rtcb->xcp.regs);
 
           /* Restore the exception context of the rtcb at the (new) head
-           * of the g_readytorun task list.
+           * of the ready-to-run task list.
            */
 
-          rtcb = (struct tcb_s*)g_readytorun.head;
+          rtcb = this_task();
 
           /* Update scheduler parameters */
 
@@ -133,10 +133,10 @@ void up_unblock_task(struct tcb_s *tcb)
         {
           /* Restore the exception context of the new task that is ready to
            * run (probably tcb).  This is the new rtcb at the head of the
-           * g_readytorun task list.
+           * ready-to-run task list.
            */
 
-          rtcb = (struct tcb_s*)g_readytorun.head;
+          rtcb = this_task();
 
 #ifdef CONFIG_ARCH_ADDRENV
          /* Make sure that the address environment for the previously
diff --git a/arch/hc/src/m9s12/m9s12_assert.c b/arch/hc/src/m9s12/m9s12_assert.c
index 7f48615c9a..afa5165620 100644
--- a/arch/hc/src/m9s12/m9s12_assert.c
+++ b/arch/hc/src/m9s12/m9s12_assert.c
@@ -191,7 +191,7 @@ static int assert_tracecallback(FAR struct usbtrace_s *trace, FAR void *arg)
 #ifdef CONFIG_ARCH_STACKDUMP
 static void up_dumpstate(void)
 {
-  struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head;
+  struct tcb_s *rtcb = this_task();
   uint16_t sp = up_getsp();
   uint16_t ustackbase;
   uint16_t ustacksize;
@@ -293,7 +293,7 @@ static void _up_assert(int errorcode)
 {
   /* Are we in an interrupt handler or the idle task? */
 
-  if (current_regs || ((struct tcb_s*)g_readytorun.head)->pid == 0)
+  if (current_regs || (this_task())->pid == 0)
     {
        (void)irqsave();
         for (;;)
@@ -323,7 +323,7 @@ static void _up_assert(int errorcode)
 void up_assert(const uint8_t *filename, int lineno)
 {
 #ifdef CONFIG_PRINT_TASKNAME
-  struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head;
+  struct tcb_s *rtcb = this_task();
 #endif
 
   board_autoled_on(LED_ASSERTION);
@@ -339,7 +339,7 @@ void up_assert(const uint8_t *filename, int lineno)
   up_dumpstate();
 
 #ifdef CONFIG_BOARD_CRASHDUMP
-  board_crashdump(up_getsp(), g_readytorun.head, filename, lineno);
+  board_crashdump(up_getsp(), this_task(), filename, lineno);
 #endif
 
   _up_assert(EXIT_FAILURE);