diff --git a/src/arch/x86_64/memory.rs b/src/arch/x86_64/memory.rs
index 1fd8e23..bdc7272 100644
--- a/src/arch/x86_64/memory.rs
+++ b/src/arch/x86_64/memory.rs
@@ -9,13 +9,12 @@ use ucore_memory::paging::PageTable;
 
 // BootInformation may trigger page fault after kernel remap
 // So just take its ownership
-pub fn init(boot_info: BootInformation) -> MemorySet {
+pub fn init(boot_info: BootInformation) {
     assert_has_not_been_called!("memory::init must be called only once");
     info!("{:?}", boot_info);
     init_frame_allocator(&boot_info);
-    let ms = remap_the_kernel(&boot_info);
+    remap_the_kernel(&boot_info);
     init_heap();
-    ms
 }
 
 fn init_frame_allocator(boot_info: &BootInformation) {
@@ -52,7 +51,7 @@ fn init_frame_allocator(boot_info: &BootInformation) {
     }
 }
 
-fn remap_the_kernel(boot_info: &BootInformation) -> MemorySet {
+fn remap_the_kernel(boot_info: &BootInformation) {
     extern { fn stack_bottom(); }
     extern { fn stack_top(); }
     let kstack = Stack {
@@ -76,7 +75,8 @@ fn remap_the_kernel(boot_info: &BootInformation) -> MemorySet {
     unsafe { memory_set.activate(); }
     info!("NEW TABLE!!!");
 
-    memory_set
+    use core::mem::forget;
+    forget(memory_set);
 }
 
 fn memory_set_from(sections: ElfSectionsTag, kstack: Stack) -> MemorySet {
diff --git a/src/arch/x86_64/mod.rs b/src/arch/x86_64/mod.rs
index 269bbcd..5a5f775 100644
--- a/src/arch/x86_64/mod.rs
+++ b/src/arch/x86_64/mod.rs
@@ -10,16 +10,15 @@ pub mod idt;
 pub mod smp;
 pub mod memory;
 
-pub fn init(multiboot_information_address: usize) -> MemorySet {
+pub fn init(multiboot_information_address: usize) {
     idt::init();
     let boot_info = unsafe { multiboot2::load(multiboot_information_address) };
     let rsdt_addr = boot_info.rsdp_v1_tag().unwrap().rsdt_address();
-    let ms = memory::init(boot_info);
+    memory::init(boot_info);
     // Now heap is available
     gdt::init();
     let acpi = driver::init(rsdt_addr);
     smp::start_other_cores(&acpi);
-    ms
 }
 
 /// The entry point for another processors
diff --git a/src/lib.rs b/src/lib.rs
index 7f72192..5bdb6ac 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -107,9 +107,9 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) -> ! {
     println!("Hello World{}", "!");
 
     io::init();
-    let ms = arch::init(multiboot_information_address);
+    arch::init(multiboot_information_address);
 
-    process::init(ms);
+    process::init();
 
     fs::load_sfs();
 
diff --git a/src/process/mod.rs b/src/process/mod.rs
index 4bc4b6e..381c22d 100644
--- a/src/process/mod.rs
+++ b/src/process/mod.rs
@@ -10,10 +10,10 @@ mod processor;
 mod scheduler;
 
 
-pub fn init(ms: MemorySet) {
+pub fn init() {
     PROCESSOR.call_once(|| {
         SpinNoIrqLock::new({
-            let initproc = Process::new_init(ms);
+            let initproc = Process::new_init();
             let idleproc = Process::new("idle", idle_thread, 0);
         let mut processor = Processor::new();
         processor.add(initproc);
diff --git a/src/process/process.rs b/src/process/process.rs
index 4c6028a..7622bc1 100644
--- a/src/process/process.rs
+++ b/src/process/process.rs
@@ -46,13 +46,13 @@ impl Process {
 
     /// Make the first kernel thread `initproc`
     /// Should be called only once
-    pub fn new_init(ms: MemorySet) -> Self {
+    pub fn new_init() -> Self {
         assert_has_not_been_called!();
         Process {
             pid: 0,
             parent: 0,
             name: String::from("init"),
-            memory_set: ms,
+            memory_set: MemorySet::new(),
             status: Status::Running,
             context: unsafe { Context::null() }, // will be set at first schedule
             is_user: false,