Fix MISRA_C_2012 rule 8.4 violation (#844)

Fix MISRA_C_2012 rule 8.4 violation

MISRA.md

@@ -24,14 +24,15 @@ MISRA C:2012 Rule 8.4: A compatible declaration shall be visible when an
         object or function with external linkage is defined.
 
 _Ref 8.4.1_
+ - pxCurrentTCB(s) is defined with external linkage but it is only referenced
+   from the assembly code in the port files. Therefore, adding a declaration in
+   header file is not useful as the assembly code will still need to declare it
+   separately.
 
-- This rule requires that a compatible declaration is made available
-  in a header file when an object with external linkage is defined.
-  pxCurrentTCB(s) is defined with external linkage but it is only
-  referenced from the assembly code in the port files. Therefore, adding
-  a declaration in header file is not useful as the assembly code will
-  still need to declare it separately.
-
+_Ref 8.4.2_
+ - xQueueRegistry is defined with external linkage because it is accessed by the
+   kernel unit tests. It is not meant to be directly accessed by the application
+   and therefore, not declared in a header file.
 
 #### Rule 11.3
 

queue.c

@@ -165,6 +165,10 @@ typedef xQUEUE Queue_t;
 /* The queue registry is simply an array of QueueRegistryItem_t structures.
  * The pcQueueName member of a structure being NULL is indicative of the
  * array position being vacant. */
+
+/* MISRA Ref 8.4.2 [Declaration shall be visible] */
+/* More details at: https://github.com/FreeRTOS/FreeRTOS-Kernel/blob/main/MISRA.md#rule-84 */
+/* coverity[misra_c_2012_rule_8_4_violation] */
     PRIVILEGED_DATA QueueRegistryItem_t xQueueRegistry[ configQUEUE_REGISTRY_SIZE ];
 
 #endif /* configQUEUE_REGISTRY_SIZE */

tasks.c

@@ -436,6 +436,9 @@ typedef tskTCB TCB_t;
 /*lint -save -e956 A manual analysis and inspection has been used to determine
  * which static variables must be declared volatile. */
 #if ( configNUMBER_OF_CORES == 1 )
+    /* MISRA Ref 8.4.1 [Declaration shall be visible] */
+    /* More details at: https://github.com/FreeRTOS/FreeRTOS-Kernel/blob/main/MISRA.md#rule-84 */
+    /* coverity[misra_c_2012_rule_8_4_violation] */
     portDONT_DISCARD PRIVILEGED_DATA TCB_t * volatile pxCurrentTCB = NULL;
 #else
     /* MISRA Ref 8.4.1 [Declaration shall be visible] */
@@ -490,7 +493,7 @@ PRIVILEGED_DATA static TaskHandle_t xIdleTaskHandles[ configNUMBER_OF_CORES ];
 /* Improve support for OpenOCD. The kernel tracks Ready tasks via priority lists.
  * For tracking the state of remote threads, OpenOCD uses uxTopUsedPriority
  * to determine the number of priority lists to read back from the remote target. */
-const volatile UBaseType_t uxTopUsedPriority = configMAX_PRIORITIES - 1U;
+static const volatile UBaseType_t uxTopUsedPriority = configMAX_PRIORITIES - 1U;
 
 /* Context switches are held pending while the scheduler is suspended.  Also,
  * interrupts must not manipulate the xStateListItem of a TCB, or any of the