--- old/include/linux/kernel.h	2004-05-04 21:48:24.000000000 +0200
+++ new/include/linux/kernel.h	2004-05-05 10:53:32.000000000 +0200
@@ -196,4 +196,11 @@ struct sysinfo {
 
 #define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0)
 
+#define WARN_ON(condition) do { \
+	if (unlikely((condition)!=0)) { \
+		printk("Badness in %s at %s:%d\n", __FUNCTION__, __FILE__, __LINE__); \
+		dump_stack(); \
+	} \
+} while (0)
+
 #endif /* _LINUX_KERNEL_H */