1 files changed, 13 insertions, 0 deletions
diff --git a/NEWS b/NEWS
index 9fe26ba6..2c7ca4a6 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,18 @@
 * What's new
 
+- Systemtap now warns about global variables being referenced from other
+  script files.  This aims to protect against unintended local-vs-global 
+  namespace collisions such as:
+
+     % cat some_tapset.stp
+     probe baz.one = bar { foo = $foo; bar = $bar }
+     % cat end_user_script.stp
+     global foo # intended to be private variable
+     probe timer.s(1) { foo ++ }
+     probe baz.* { println(foo, pp()) }
+     % stap end_user_script.stp
+     WARNING: cross-file global variable reference to foo from some_tapset.stp
+
 - Preprocessor conditional for kernel configuration testing:
   %( CONFIG_foo == "y" %? ... %)