note: directly returns the taskname pointer

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>

drivers/note/note_driver.c

@@ -177,8 +177,7 @@ FAR static struct note_driver_s *
 static struct note_taskname_s g_note_taskname;
 #endif
 
-#if defined(CONFIG_SCHED_INSTRUMENTATION_FILTER) || \
+#if defined(CONFIG_SCHED_INSTRUMENTATION_FILTER)
-    (CONFIG_DRIVERS_NOTE_TASKNAME_BUFSIZE > 0)
 static spinlock_t g_note_lock;
 #endif
 
@@ -1933,39 +1932,29 @@ void sched_note_filter_tag(FAR struct note_filter_tag_s *oldf,
  *
  * Input Parameters:
  *   PID - Task ID
- *   name - Task name buffer
- *          this buffer must be greater than CONFIG_TASK_NAME_SIZE + 1
  *
  * Returned Value:
- *   Retrun OK if task name can be retrieved, otherwise -ESRCH
+ *   Retrun name if task name can be retrieved, otherwise NULL
- *
  ****************************************************************************/
 
-int note_get_taskname(pid_t pid, FAR char *buffer)
+FAR const char *note_get_taskname(pid_t pid)
 {
   FAR struct note_taskname_info_s *ti;
   FAR struct tcb_s *tcb;
-  irqstate_t irq_mask;
 
-  irq_mask = spin_lock_irqsave_wo_note(&g_note_lock);
   tcb = nxsched_get_tcb(pid);
   if (tcb != NULL)
     {
-      strlcpy(buffer, tcb->name, CONFIG_TASK_NAME_SIZE + 1);
+      return tcb->name;
-      spin_unlock_irqrestore_wo_note(&g_note_lock, irq_mask);
-      return OK;
     }
 
   ti = note_find_taskname(pid);
   if (ti != NULL)
     {
-      strlcpy(buffer, ti->name, CONFIG_TASK_NAME_SIZE + 1);
+      return ti->name;
-      spin_unlock_irqrestore_wo_note(&g_note_lock, irq_mask);
-      return OK;
     }
 
-  spin_unlock_irqrestore_wo_note(&g_note_lock, irq_mask);
+  return NULL;
-  return -ESRCH;
 }
 
 #endif

drivers/note/noteram_driver.c

@@ -829,11 +829,10 @@ get_task_context(pid_t pid, FAR struct noteram_dump_context_s *ctx)
 
 #ifdef CONFIG_DRIVERS_NOTE_TASKNAME_BUFSIZE
         {
-          char taskname[CONFIG_DRIVERS_NOTE_TASKNAME_BUFSIZE];
+          FAR const char *taskname;
-          int res;
 
-          res = note_get_taskname(pid, taskname);
+          taskname = note_get_taskname(pid);
-          if (res == 0)
+          if (taskname != NULL)
             {
               copy_task_name((*tctxp)->name, taskname);
             }

include/nuttx/note/note_driver.h

@@ -145,15 +145,13 @@ int note_initialize(void);
  *
  * Input Parameters:
  *   PID - Task ID
- *   name - Task name buffer
- *          this buffer must be greater than CONFIG_TASK_NAME_SIZE + 1
  *
  * Returned Value:
- *   Retrun OK if task name can be retrieved, otherwise -ESRCH
+ *   Retrun name if task name can be retrieved, otherwise NULL
  *
  ****************************************************************************/
 
-int note_get_taskname(pid_t pid, FAR char *name);
+FAR const char *note_get_taskname(pid_t pid);
 
 #endif /* defined(CONFIG_DRIVERS_NOTE_TASKNAME_BUFSIZE) && \
         * CONFIG_DRIVERS_NOTE_TASKNAME_BUFSIZE > 0