diff --git a/scripts/coccinelle/bool_function_type.cocci b/scripts/coccinelle/bool_function_type.cocci
new file mode 100644
index 0000000000..71bf4f53b8
--- /dev/null
+++ b/scripts/coccinelle/bool_function_type.cocci
@@ -0,0 +1,19 @@
+@@
+identifier fn;
+typedef bool;
+symbol false;
+symbol true;
+@@
+
+- int
++ bool
+fn (...)
+{
+?...
+return
+(
+  true
+|
+  false
+);
+}