Get rid of unnecessary barrier. Improve comment.

[pintos-anon] / grading / vm / mmap-overlap.c

diff --git a/grading/vm/mmap-overlap.c b/grading/vm/mmap-overlap.c
index c4a06e67c0560cbce15a9187cc84070178472728..d2104b8b8139652bfd69325a9a518bc74174565a 100644 (file)
--- a/grading/vm/mmap-overlap.c
+++ b/grading/vm/mmap-overlap.c
@@ -14,6 +14,12 @@ main (void)
   size_t i;
   int fd[2];
 
+#ifndef PINTOS
+  printf ("Sorry, this test won't work on POSIX,\n"
+          "because POSIX will accept overlapping mmaps.\n");
+  abort ();
+#endif
+
   printf ("(mmap-overlap) begin\n");
 
   for (i = 0; i < 2; i++) 
@@ -24,7 +30,7 @@ main (void)
           printf ("(mmap-overlap) open() failed\n");
           return 1;
         }
-      if (!mmap (fd[i], start, 8192))
+      if (mmap (fd[i], start) == MAP_FAILED)
         {
           if (i == 1) 
             return 0;