No external modules should be touching these symbols.
If they are, they are broken.

diff -urNp --exclude-from=/home/davej/.exclude linux-3022/fs/open.c linux-10000/fs/open.c
--- linux-3022/fs/open.c
+++ linux-10000/fs/open.c
@@ -976,7 +976,6 @@ out_error:
 	fd = error;
 	goto out;
 }
-EXPORT_SYMBOL_GPL(sys_open);
 
 #ifndef __alpha__