From 0a70fb4c1c180d6ad6cd4c1dcd3fae8c5d4dd62e Mon Sep 17 00:00:00 2001
From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Sat, 16 Sep 2017 14:10:45 +0900
Subject: bug.h: move runtime BUG/WARN macros into <linux/bug.h>

Collect runtime BUG/WARN into a self-contained header <linux/bug.h>
to make these macros easier to use.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---
 include/linux/bug.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'include/linux/bug.h')

diff --git a/include/linux/bug.h b/include/linux/bug.h
index 133544ca46f..f07bb716fc0 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -1,6 +1,34 @@
 #ifndef _LINUX_BUG_H
 #define _LINUX_BUG_H
 
+#include <vsprintf.h> /* for panic() */
 #include <linux/build_bug.h>
+#include <linux/compiler.h>
+#include <linux/printk.h>
+
+#define BUG() do { \
+	printk("BUG at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
+	panic("BUG!"); \
+} while (0)
+
+#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
+
+#define WARN_ON(condition) ({						\
+	int __ret_warn_on = !!(condition);				\
+	if (unlikely(__ret_warn_on))					\
+		printk("WARNING at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
+	unlikely(__ret_warn_on);					\
+})
+
+#define WARN_ON_ONCE(condition)	({				\
+	static bool __warned;					\
+	int __ret_warn_once = !!(condition);			\
+								\
+	if (unlikely(__ret_warn_once && !__warned)) {		\
+		__warned = true;				\
+		WARN_ON(1);					\
+	}							\
+	unlikely(__ret_warn_once);				\
+})
 
 #endif	/* _LINUX_BUG_H */
-- 
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