Reduce dead code, fix aarch64.

src/scheme/memory.rs

@@ -2,7 +2,6 @@ use core::num::NonZeroUsize;
 
 use alloc::{sync::Arc, vec::Vec};
 use rmm::PhysicalAddress;
-use spin::RwLock;
 
 use crate::{
     context::memory::{handle_notify_files, AddrSpace, Grant, PageSpan, AddrSpaceWrapper},

src/scheme/mod.rs

@@ -13,7 +13,7 @@ use spin::{Once, RwLock, RwLockReadGuard, RwLockWriteGuard};
 use syscall::{EventFlags, MunmapFlags, SendFdFlags, SEEK_CUR, SEEK_END, SEEK_SET};
 
 use crate::{
-    context::{file::FileDescription, memory::{AddrSpace, AddrSpaceWrapper}},
+    context::{file::FileDescription, memory::AddrSpaceWrapper},
     syscall::{
         error::*,
         usercopy::{UserSliceRo, UserSliceWo},

src/scheme/user.rs

@@ -30,7 +30,7 @@ use crate::{
     },
     event,
     memory::Frame,
-    paging::{mapper::InactiveFlusher, Page, VirtualAddress, PAGE_SIZE},
+    paging::{Page, VirtualAddress, PAGE_SIZE},
     scheme::SchemeId,
     sync::WaitQueue,
     syscall::{