diff -u src/filesys/Make.vars~ src/filesys/Make.vars
--- src/filesys/Make.vars~ 2005-05-24 14:46:45.000000000 -0700
+++ src/filesys/Make.vars 2005-06-16 15:09:31.000000000 -0700
-@@ -6,6 +6,6 @@ KERNEL_SUBDIRS = threads devices lib lib
- TEST_SUBDIRS = tests/userprog tests/filesys/base tests/filesys/extended
+@@ -6,7 +6,7 @@ KERNEL_SUBDIRS = threads devices lib lib
+ GRADING_FILE = $(SRCDIR)/tests/filesys/Grading.no-vm
# Uncomment the lines below to enable VM.
-#os.dsk: DEFINES += -DVM
-#KERNEL_SUBDIRS += vm
-#TEST_SUBDIRS += tests/vm
+-#GRADING_FILE = $(SRCDIR)/tests/filesys/Grading.with-vm
+os.dsk: DEFINES += -DVM
+KERNEL_SUBDIRS += vm
+TEST_SUBDIRS += tests/vm
++GRADING_FILE = $(SRCDIR)/tests/filesys/Grading.with-vm
diff -u src/filesys/cache.c~ src/filesys/cache.c
--- src/filesys/cache.c~ 1969-12-31 16:00:00.000000000 -0800
+++ src/filesys/cache.c 2005-06-16 15:09:31.000000000 -0700