add stub for mmap/munmap + fix build errors in subdirectories

1 files changed, 1 insertions, 1 deletions

diff --git a/userprog/exception.c b/userprog/exception.c
index debe7f0..a2873d5 100644
--- a/userprog/exception.c
+++ b/userprog/exception.c
@@ -175,7 +175,7 @@ page_fault (struct intr_frame *f)
           printf ("Unable to load page at %p in %s context.\n",
             fault_addr, user ? "user" : "kernel");
         }
-      /* there's no page in our page table but we might still have an valid
+      /* there's no page in our page table but we might still have a valid
          stack access and need to expand our stack. so just check for that.
          the maxium offset we consider as a valid access is caused by the PUSHA
          instruction. it's 32 bytes below the current stack pointer */