diff --git a/src/clock.c b/src/clock.c
index 66923e5c00..0880d8d241 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -111,7 +111,7 @@ rt_tick_t rt_tick_from_millisecond(rt_int32_t ms)
         tick = RT_TICK_PER_SECOND * (ms / 1000);
         tick += (RT_TICK_PER_SECOND * (ms % 1000) + 999) / 1000;
     }
-    
+
     /* return the calculated tick */
     return tick;
 }
diff --git a/src/components.c b/src/components.c
index 8ea5654d0c..9709d0aae2 100644
--- a/src/components.c
+++ b/src/components.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/src/cpu.c b/src/cpu.c
index 96e585713b..48ddb12c46 100644
--- a/src/cpu.c
+++ b/src/cpu.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/src/device.c b/src/device.c
index a4f004fb69..388c2ecf12 100644
--- a/src/device.c
+++ b/src/device.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/src/idle.c b/src/idle.c
index aa14552a49..24dfffbc6d 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -211,7 +211,7 @@ static void rt_thread_idle_entry(void *parameter)
 #endif
 
         rt_thread_idle_excute();
-#ifdef RT_USING_PM        
+#ifdef RT_USING_PM
         rt_system_power_manager();
 #endif
     }
diff --git a/src/ipc.c b/src/ipc.c
index 37b05b9ae3..111d724c23 100755
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -34,7 +34,7 @@
  * 2013-09-14     Grissiom     add an option check in rt_event_recv
  * 2018-10-02     Bernard      add 64bit support for mailbox
  * 2019-09-16     tyx          add send wait support for message queue
- * 2020-07-29     Meco Man     fix thread->event_set/event_info when received an 
+ * 2020-07-29     Meco Man     fix thread->event_set/event_info when received an
  *                             event without pending
  * 2020-10-11     Meco Man     add value overflow-check code
  * 2021-01-03     Meco Man     add rt_mb_urgent()
@@ -124,7 +124,7 @@ rt_inline rt_err_t rt_ipc_list_suspend(rt_list_t        *list,
         break;
 
     default:
-        break;  
+        break;
     }
 
     return RT_EOK;
@@ -959,7 +959,7 @@ rt_err_t rt_mutex_release(rt_mutex_t mutex)
                 rt_hw_interrupt_enable(temp); /* enable interrupt */
                 return -RT_EFULL; /* value overflowed */
             }
-            
+
             /* clear owner */
             mutex->owner             = RT_NULL;
             mutex->original_priority = 0xff;
@@ -1280,11 +1280,11 @@ rt_err_t rt_event_recv(rt_event_t   event,
         /* set received event */
         if (recved)
             *recved = (event->set & set);
-            
-        /* fill thread event info */            
+
+        /* fill thread event info */
         thread->event_set = (event->set & set);
         thread->event_info = option;
-        
+
         /* received event */
         if (option & RT_EVENT_FLAG_CLEAR)
             event->set &= ~set;
@@ -1649,7 +1649,7 @@ rt_err_t rt_mb_send_wait(rt_mailbox_t mb,
     ++ mb->in_offset;
     if (mb->in_offset >= mb->size)
         mb->in_offset = 0;
-    
+
     if(mb->entry < RT_MB_ENTRY_MAX)
     {
         /* increase message entry */
@@ -1660,7 +1660,7 @@ rt_err_t rt_mb_send_wait(rt_mailbox_t mb,
         rt_hw_interrupt_enable(temp); /* enable interrupt */
         return -RT_EFULL; /* value overflowed */
     }
-    
+
     /* resume suspended thread */
     if (!rt_list_isempty(&mb->parent.suspend_thread))
     {
@@ -2409,7 +2409,7 @@ rt_err_t rt_mq_urgent(rt_mq_t mq, const void *buffer, rt_size_t size)
         rt_hw_interrupt_enable(temp); /* enable interrupt */
         return -RT_EFULL; /* value overflowed */
     }
-    
+
     /* resume suspended thread */
     if (!rt_list_isempty(&mq->parent.suspend_thread))
     {
diff --git a/src/irq.c b/src/irq.c
index 311d297bfe..177c1a9ff5 100644
--- a/src/irq.c
+++ b/src/irq.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -21,7 +21,7 @@ static void (*rt_interrupt_leave_hook)(void);
 
 /**
  * @ingroup Hook
- * This function set a hook function when the system enter a interrupt 
+ * This function set a hook function when the system enter a interrupt
  *
  * @note the hook function must be simple and never be blocked or suspend.
  */
@@ -31,7 +31,7 @@ void rt_interrupt_enter_sethook(void (*hook)(void))
 }
 /**
  * @ingroup Hook
- * This function set a hook function when the system exit a interrupt. 
+ * This function set a hook function when the system exit a interrupt.
  *
  * @note the hook function must be simple and never be blocked or suspend.
  */
diff --git a/src/kservice.c b/src/kservice.c
index 9fc3971c7e..79ee4c2b9d 100644
--- a/src/kservice.c
+++ b/src/kservice.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -456,7 +456,7 @@ RTM_EXPORT(rt_strncmp);
 rt_int32_t rt_strcmp(const char *cs, const char *ct)
 {
     while (*cs && *cs == *ct)
-    {        
+    {
         cs++;
         ct++;
     }
@@ -1127,10 +1127,10 @@ rt_device_t rt_console_set_device(const char *name)
 
     /* find new console device */
     new_device = rt_device_find(name);
-    
+
     /* check whether it's a same device */
     if (new_device == old_device) return RT_NULL;
-    
+
     if (new_device != RT_NULL)
     {
         if (_console_device != RT_NULL)
diff --git a/src/mem.c b/src/mem.c
index c03c8b3452..ac0d27f2c3 100644
--- a/src/mem.c
+++ b/src/mem.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -489,7 +489,7 @@ void *rt_realloc(void *rmem, rt_size_t newsize)
         {
             ((struct heap_mem *)&heap_ptr[mem2->next])->prev = ptr2;
         }
-        
+
         if (mem2 < lfree)
         {
             /* the splited struct is now the lowest */
diff --git a/src/memheap.c b/src/memheap.c
index 449e66e975..a5d86f6347 100644
--- a/src/memheap.c
+++ b/src/memheap.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -130,7 +130,7 @@ rt_err_t rt_memheap_detach(struct rt_memheap *heap)
     RT_ASSERT(heap);
     RT_ASSERT(rt_object_get_type(&heap->parent) == RT_Object_Class_MemHeap);
     RT_ASSERT(rt_object_is_systemobject(&heap->parent));
-    
+
     rt_sem_detach(&heap->lock);
     rt_object_detach(&(heap->parent));
 
@@ -765,7 +765,7 @@ void dump_used_memheap(struct rt_memheap *mh)
 
     rt_kprintf("\nmemory heap address:\n");
     rt_kprintf("heap_ptr: 0x%08x\n", mh->start_addr);
-    rt_kprintf("free	: 0x%08x\n", mh->available_size);
+    rt_kprintf("free    : 0x%08x\n", mh->available_size);
     rt_kprintf("max_used: 0x%08x\n", mh->max_used_size);
     rt_kprintf("size    : 0x%08x\n", mh->pool_size);
 
diff --git a/src/mempool.c b/src/mempool.c
index db614032aa..1de48940d7 100644
--- a/src/mempool.c
+++ b/src/mempool.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/src/object.c b/src/object.c
index 56263618b3..013e2d1e33 100644
--- a/src/object.c
+++ b/src/object.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -200,7 +200,7 @@ void rt_object_put_sethook(void (*hook)(struct rt_object *object))
 /**
  * This function will return the specified type of object information.
  *
- * @param type the type of object, which can be 
+ * @param type the type of object, which can be
  *             RT_Object_Class_Thread/Semaphore/Mutex... etc
  *
  * @return the object type information or RT_NULL
@@ -220,7 +220,7 @@ RTM_EXPORT(rt_object_get_information);
 /**
  * This function will return the length of object list in object container.
  *
- * @param type the type of object, which can be 
+ * @param type the type of object, which can be
  *             RT_Object_Class_Thread/Semaphore/Mutex... etc
  * @return the length of object list
  */
@@ -247,10 +247,10 @@ int rt_object_get_length(enum rt_object_class_type type)
 RTM_EXPORT(rt_object_get_length);
 
 /**
- * This function will copy the object pointer of the specified type, 
+ * This function will copy the object pointer of the specified type,
  * with the maximum size specified by maxlen.
  *
- * @param type the type of object, which can be 
+ * @param type the type of object, which can be
  *             RT_Object_Class_Thread/Semaphore/Mutex... etc
  * @param pointers the pointers will be saved to
  * @param maxlen the maximum number of pointers can be saved
diff --git a/src/scheduler.c b/src/scheduler.c
index 06f305ea0b..c03c20d030 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -270,10 +270,10 @@ void rt_system_scheduler_start(void)
 #ifdef RT_USING_SMP
 /**
  * This function will handle IPI interrupt and do a scheduling in system;
- * 
+ *
  * @param vector, the number of IPI interrupt for system scheduling
  * @param param, use RT_NULL
- * 
+ *
  * NOTE: this function should be invoke or register as ISR in BSP.
  */
 void rt_scheduler_ipi_handler(int vector, void *param)
@@ -283,7 +283,7 @@ void rt_scheduler_ipi_handler(int vector, void *param)
 
 /**
  * This function will perform one scheduling. It will select one thread
- * with the highest priority level in global ready queue or local ready queue, 
+ * with the highest priority level in global ready queue or local ready queue,
  * then switch to it.
  */
 void rt_schedule(void)
diff --git a/src/signal.c b/src/signal.c
index bb9339ab6c..c2c3e975cb 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/src/slab.c b/src/slab.c
index 0872ecf092..12ca1a938c 100644
--- a/src/slab.c
+++ b/src/slab.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  */
diff --git a/src/thread.c b/src/thread.c
index beef93f46a..402ed66acb 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/src/timer.c b/src/timer.c
index 2eaca225bc..836df51e06 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *