Reduce dead code, fix aarch64.

src/syscall/debug.rs

@@ -9,7 +9,7 @@ use super::{
     usercopy::UserSlice,
 };
 
-use crate::{percpu::PercpuBlock, syscall::error::Result, time};
+use crate::syscall::error::Result;
 
 struct ByteStr<'a>(&'a [u8]);
 

src/syscall/driver.rs

@@ -3,7 +3,7 @@ use alloc::sync::Arc;
 use crate::{
     context,
     paging::VirtualAddress,
-    syscall::error::{Error, Result, EFAULT, EINVAL, EPERM, ESRCH},
+    syscall::error::{Error, Result, EFAULT, EPERM, ESRCH},
 };
 fn enforce_root() -> Result<()> {
     let contexts = context::contexts();

src/syscall/process.rs

@@ -11,13 +11,13 @@ use crate::context::{
 
 use crate::{
     context, interrupt,
-    paging::{mapper::PageFlushAll, Page, PageFlags, VirtualAddress, PAGE_SIZE},
+    paging::{Page, VirtualAddress, PAGE_SIZE},
     ptrace,
     syscall::{
         data::{SigAction, SignalStack},
         error::*,
         flag::{
-            wifcontinued, wifstopped, MapFlags, WaitFlags, PTRACE_STOP_EXIT, SIGCONT, SIGTERM,
+            wifcontinued, wifstopped, MapFlags, WaitFlags, PTRACE_STOP_EXIT, SIGCONT,
             SIG_BLOCK, SIG_SETMASK, SIG_UNBLOCK, WCONTINUED, WNOHANG, WUNTRACED,
         },
         ptrace_event,