diff --git a/src/clock.c b/src/clock.c
index 66923e5c00c8eeb3562bcde05acb36535d06572f..0880d8d24189b242b2a8cf405ef6c6f2b97ce00b 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 8ea5654d0c858367ecc1d4446a9821fa4e0906ed..9709d0aae23b8b80cb9891440a624890b01260b7 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 96e585713ba39adc1266e74b00f15b7f72942f9f..48ddb12c467f5de4da4081d206018e241f41934f 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 a4f004fb696d7ed4846a29f0aef490773f1c7f6e..388c2ecf123e603c13c22a5d81612be9be27243e 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 aa14552a49f2ddb9306140bfe714c1a9781bd0ab..24dfffbc6d4e6b56860cc07ebd9c7ec38b2fc555 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 37b05b9ae352b88de4f7f19cc8c2905bf2662929..111d724c2326f45fdcf4b1623dbbf5d44bcf5cce 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 311d297bfe7760e56e3b1051d0c19311c61a732b..177c1a9ff5321adb8be5dd05d264397b1a5b37cb 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 9fc3971c7e1d9917085a15fe04d5144ca9074186..79ee4c2b9d03512c55f20b75a3d607f8bb265579 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 c03c8b3452854b6c82ca2e94cc3b2e4e292377ef..ac0d27f2c35d4dd8e830b48ad07f2f108a07e69a 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 449e66e9757a62b17e996c9e7982449264bf201b..a5d86f634799fb3aed6b0870f72844ed063b25d7 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 db614032aa67ac7d357408b9521192c39555adbe..1de48940d7812ae9fbb2e0095b17fa66234222ec 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 56263618b3c5047b47ae8f77ed67e8373c42f9ae..013e2d1e336869813f6b3f287c08542772df5ffd 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 06f305ea0b0ba6a49c3200a07d49e5d68f4daf1f..c03c20d030bf74ea6616d5b57e8844162a0ee0a4 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 bb9339ab6c3f216cdaa5ab3569aa70543d415232..c2c3e975cb4c9c8ba30f9dd9a51bb80ef18fc0bd 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 0872ecf092251ce7b638de12fb598ea621bdb437..12ca1a938cc584dc0a93083544e9e339c96a938d 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 beef93f46a9c1798d8b7c3fcf219f15e763d48a1..402ed66acb9c63a2569020a25c111b45152d84b3 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 2eaca225bc4a39477eebfe22e626e6d2056384ba..836df51e06f6a540f6b6152bef17ac66b06e1053 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
  *