Allow students to easily disable VM.

diff --git a/src/filesys/Makefile.vars b/src/filesys/Makefile.vars
index 03e8f0803fcd2e82322fba74118919c9174871d0..5899e51100fe5324fb924199c215f3e3a14f4e9c 100644 (file)
--- a/src/filesys/Makefile.vars
+++ b/src/filesys/Makefile.vars
@@ -1,2 +1,6 @@
 DEFINES = -DUSERPROG -DFILESYS
 SUBDIRS = threads devices lib lib/kernel userprog filesys
+
+# Comment out the two lines below to disable VM.
+DEFINES += -DVM
+SUBDIRS += vm