diff --git a/src/threads/thread.h b/src/threads/thread.h
index 0983855..fe7f362 100644
--- a/src/threads/thread.h
+++ b/src/threads/thread.h
@@ -149,10 +149,6 @@ struct thread
     struct hash open_files;             /* Hash Table of FD -> Struct File. */
 #endif
 
-#ifdef VM
-  struct hash pages;                    /* Table of open user pages. */
-#endif
-
     void *curr_esp;
 
     /* Owned by thread.c. */
diff --git a/src/userprog/Make.vars b/src/userprog/Make.vars
index e4dbb08..23bae3d 100644
--- a/src/userprog/Make.vars
+++ b/src/userprog/Make.vars
@@ -1,7 +1,7 @@
 # -*- makefile -*-
 
-kernel.bin: DEFINES = -DUSERPROG -DFILESYS
-KERNEL_SUBDIRS = threads devices lib lib/kernel userprog filesys
+kernel.bin: DEFINES = -DUSERPROG -DFILESYS -DVM
+KERNEL_SUBDIRS = threads devices lib lib/kernel userprog filesys vm
 TEST_SUBDIRS = tests/userprog tests/userprog/no-vm tests/filesys/base
 GRADING_FILE = $(SRCDIR)/tests/userprog/Grading
 SIMULATOR = --qemu
diff --git a/src/vm/mmap.c b/src/vm/mmap.c
index c34991d..b369650 100644
--- a/src/vm/mmap.c
+++ b/src/vm/mmap.c
@@ -126,21 +126,3 @@ mmap_cleanup (struct hash_elem *e, void *aux UNUSED)
   struct mmap_entry *mmap = hash_entry (e, struct mmap_entry, elem);
   mmap_unmap (mmap);
 }
-
-/* Updates the 'owner' thread's page table entry for virtual address 'upage'
-   to have a present bit of 0 and stores the specified swap slot value in the
-   entry for later retrieval from disk. */
-void
-page_set_swap (struct thread *owner, void *upage, size_t swap_slot)
-{
-
-}
-
-/* Given that the page with user address 'upage' owned by 'owner' is flagged
-   to be in the swap disk via the owner's page table, returns its stored
-   swap slot. Otherwise panics the kernel. */
-size_t
-page_get_swap (struct thread *owner, void *upage)
-{
-  return 0;
-}