diff --git a/labcodes/lab8/kern/process/proc.h b/labcodes/lab8/kern/process/proc.h
index 259245a..384c932 100644
--- a/labcodes/lab8/kern/process/proc.h
+++ b/labcodes/lab8/kern/process/proc.h
@@ -41,7 +41,6 @@ struct context {
 extern list_entry_t proc_list;
 
 struct inode;
-struct fs_struct;
 
 struct proc_struct {
     enum proc_state state;                      // Process state
@@ -56,7 +55,7 @@ struct proc_struct {
     uintptr_t cr3;                              // CR3 register: the base addr of Page Directroy Table(PDT)
     uint32_t flags;                             // Process flag
     char name[PROC_NAME_LEN + 1];               // Process name
-    list_entry_t list_link;                     // Process link list 
+    list_entry_t list_link;                     // Process link list
     list_entry_t hash_link;                     // Process hash list
     int exit_code;                              // exit code (be sent to parent proc)
     uint32_t wait_state;                        // waiting state
@@ -65,7 +64,7 @@ struct proc_struct {
     list_entry_t run_link;                      // the entry linked in run queue
     int time_slice;                             // time slice for occupying the CPU
     skew_heap_entry_t lab6_run_pool;            // FOR LAB6 ONLY: the entry in the run pool
-    uint32_t lab6_stride;                       // FOR LAB6 ONLY: the current stride of the process 
+    uint32_t lab6_stride;                       // FOR LAB6 ONLY: the current stride of the process
     uint32_t lab6_priority;                     // FOR LAB6 ONLY: the priority of process, set by lab6_set_priority(uint32_t)
     struct files_struct *filesp;                // the file related info(pwd, files_count, files_array, fs_semaphore) of process
 };
@@ -98,7 +97,7 @@ int do_yield(void);
 int do_execve(const char *name, int argc, const char **argv);
 int do_wait(int pid, int *code_store);
 int do_kill(int pid);
-//FOR LAB6, set the process's priority (bigger value will get more CPU time) 
+//FOR LAB6, set the process's priority (bigger value will get more CPU time)
 void lab6_set_priority(uint32_t priority);
 int do_sleep(unsigned int time);
 #endif /* !__KERN_PROCESS_PROC_H__ */
diff --git a/labcodes_answer/lab8_result/kern/process/proc.h b/labcodes_answer/lab8_result/kern/process/proc.h
index 259245a..384c932 100644
--- a/labcodes_answer/lab8_result/kern/process/proc.h
+++ b/labcodes_answer/lab8_result/kern/process/proc.h
@@ -41,7 +41,6 @@ struct context {
 extern list_entry_t proc_list;
 
 struct inode;
-struct fs_struct;
 
 struct proc_struct {
     enum proc_state state;                      // Process state
@@ -56,7 +55,7 @@ struct proc_struct {
     uintptr_t cr3;                              // CR3 register: the base addr of Page Directroy Table(PDT)
     uint32_t flags;                             // Process flag
     char name[PROC_NAME_LEN + 1];               // Process name
-    list_entry_t list_link;                     // Process link list 
+    list_entry_t list_link;                     // Process link list
     list_entry_t hash_link;                     // Process hash list
     int exit_code;                              // exit code (be sent to parent proc)
     uint32_t wait_state;                        // waiting state
@@ -65,7 +64,7 @@ struct proc_struct {
     list_entry_t run_link;                      // the entry linked in run queue
     int time_slice;                             // time slice for occupying the CPU
     skew_heap_entry_t lab6_run_pool;            // FOR LAB6 ONLY: the entry in the run pool
-    uint32_t lab6_stride;                       // FOR LAB6 ONLY: the current stride of the process 
+    uint32_t lab6_stride;                       // FOR LAB6 ONLY: the current stride of the process
     uint32_t lab6_priority;                     // FOR LAB6 ONLY: the priority of process, set by lab6_set_priority(uint32_t)
     struct files_struct *filesp;                // the file related info(pwd, files_count, files_array, fs_semaphore) of process
 };
@@ -98,7 +97,7 @@ int do_yield(void);
 int do_execve(const char *name, int argc, const char **argv);
 int do_wait(int pid, int *code_store);
 int do_kill(int pid);
-//FOR LAB6, set the process's priority (bigger value will get more CPU time) 
+//FOR LAB6, set the process's priority (bigger value will get more CPU time)
 void lab6_set_priority(uint32_t priority);
 int do_sleep(unsigned int time);
 #endif /* !__KERN_PROCESS_PROC_H__ */