diff --git a/crate/memory/src/swap/mod.rs b/crate/memory/src/swap/mod.rs
index 5f47391..a161dcb 100644
--- a/crate/memory/src/swap/mod.rs
+++ b/crate/memory/src/swap/mod.rs
@@ -108,7 +108,7 @@ impl<T: PageTable, M: SwapManager, S: Swapper> SwapExt<T, M, S> {
     **  @param addr: VirtAddr        the target page's virtual address
     */
     pub unsafe fn set_swappable<T2: InactivePageTable>(&mut self, pt: *mut T2, addr: VirtAddr){
-        let Self {ref mut page_table, ref mut swap_manager, ref mut swapper} = self;
+        let Self {ref mut page_table, ref mut swap_manager, ..} = self;
         let targetpt = &mut *(pt);
         let pttoken = {
             info!("SET_SWAPPABLE: the target page table token is {:x?}, addr is {:x?}", targetpt.token(), addr);
@@ -209,7 +209,7 @@ impl<T: PageTable, M: SwapManager, S: Swapper> SwapExt<T, M, S> {
     **                               the error if failed
     */
     fn swap_out<T2: InactivePageTable>(&mut self, frame: &Frame) -> Result<PhysAddr, SwapError> {
-        let Self {ref mut page_table, ref mut swap_manager, ref mut swapper} = self;
+        let Self {ref mut page_table, ref mut swapper, ..} = self;
         let ret = unsafe{
             let pt = &mut *(frame.get_page_table() as *mut T2);
             pt.with(|| {
diff --git a/crate/process/src/event_hub.rs b/crate/process/src/event_hub.rs
index 97fa80c..62d2cec 100644
--- a/crate/process/src/event_hub.rs
+++ b/crate/process/src/event_hub.rs
@@ -69,6 +69,7 @@ impl<T: PartialEq> EventHub<T> {
         }
         self.timers.insert(i, timer);
     }
+    #[allow(dead_code)]
     pub fn get_time(&self) -> Time {
         self.tick
     }
diff --git a/crate/process/src/process_manager.rs b/crate/process/src/process_manager.rs
index d052470..2ca17b5 100644
--- a/crate/process/src/process_manager.rs
+++ b/crate/process/src/process_manager.rs
@@ -6,6 +6,7 @@ use crate::scheduler::Scheduler;
 use crate::event_hub::EventHub;
 
 struct Process {
+    #[allow(dead_code)]
     id: Pid,
     status: Status,
     status_after_stop: Status,
diff --git a/crate/process/src/scheduler.rs b/crate/process/src/scheduler.rs
index 55e10e6..a73960d 100644
--- a/crate/process/src/scheduler.rs
+++ b/crate/process/src/scheduler.rs
@@ -79,7 +79,7 @@ mod rr {
             *rest == 0
         }
 
-        fn set_priority(&mut self, pid: usize, priority: u8) {
+        fn set_priority(&mut self, _pid: usize, _priority: u8) {
         }
 
         fn move_to_head(&mut self, pid: usize) {
diff --git a/crate/process/src/thread.rs b/crate/process/src/thread.rs
index 65406c4..7657492 100644
--- a/crate/process/src/thread.rs
+++ b/crate/process/src/thread.rs
@@ -23,7 +23,7 @@ fn processor() -> &'static Processor {
 #[linkage = "weak"]
 #[no_mangle]
 /// Construct a `Context` of the new kernel thread
-fn new_kernel_context(entry: extern fn(usize) -> !, arg: usize) -> Box<Context> {
+fn new_kernel_context(_entry: extern fn(usize) -> !, _arg: usize) -> Box<Context> {
     unimplemented!("thread: Please implement and export `new_kernel_context`")
 }
 
diff --git a/kernel/src/syscall.rs b/kernel/src/syscall.rs
index e438ee8..5ba5cb3 100644
--- a/kernel/src/syscall.rs
+++ b/kernel/src/syscall.rs
@@ -374,8 +374,10 @@ impl From<FileInfo> for Stat {
             mode: match info.type_ {
                 FileType::File => StatMode::FILE,
                 FileType::Dir => StatMode::DIR,
-                #[allow(unreachable_patterns)]
-                _ => StatMode::NULL,
+                // _ => StatMode::NULL,
+                //Note: we should mark FileType as #[non_exhaustive]
+                //      but it is currently not implemented for enum
+                //      see rust-lang/rust#44109
             },
             nlinks: info.nlinks as u32,
             blocks: info.blocks as u32,