From 6fd22f19c494cba9c14db8c21309e12fd20c0bab Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@infradead.org>
Date: Wed, 30 Jan 2008 13:32:50 +0100
Subject: [PATCH] --- yaml --- r: 80189 b: refs/heads/master c:
 79b4cc5ee7a8086ac2c9c0afa52e6d687ce1ffef h: refs/heads/master i:   80187:
 6f41f663d5dadd8e1579d5a0a6f40a53772d5ff2 v: v3

---
 [refs]                          |  2 +-
 trunk/include/asm-generic/bug.h | 10 +++++-----
 trunk/kernel/panic.c            | 15 +++++++++++++++
 3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/[refs] b/[refs]
index ca33fbb508d9..fc56fde43584 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3a6a62f96f168d192fb0cc9c0b5ee2584740b32d
+refs/heads/master: 79b4cc5ee7a8086ac2c9c0afa52e6d687ce1ffef
diff --git a/trunk/include/asm-generic/bug.h b/trunk/include/asm-generic/bug.h
index 1a0e1a7684bd..2632328d8646 100644
--- a/trunk/include/asm-generic/bug.h
+++ b/trunk/include/asm-generic/bug.h
@@ -32,11 +32,11 @@ struct bug_entry {
 #endif
 
 #ifndef __WARN
-#define __WARN() do {							\
-	printk("WARNING: at %s:%d %s()\n", __FILE__,			\
-		__LINE__, __FUNCTION__);				\
-	dump_stack();							\
-} while (0)
+#ifndef __ASSEMBLY__
+extern void warn_on_slowpath(const char *file, const int line);
+#define WANT_WARN_ON_SLOWPATH
+#endif
+#define __WARN() warn_on_slowpath(__FILE__, __LINE__)
 #endif
 
 #ifndef WARN_ON
diff --git a/trunk/kernel/panic.c b/trunk/kernel/panic.c
index da4d6bac270e..0ebea438278a 100644
--- a/trunk/kernel/panic.c
+++ b/trunk/kernel/panic.c
@@ -20,6 +20,7 @@
 #include <linux/kexec.h>
 #include <linux/debug_locks.h>
 #include <linux/random.h>
+#include <linux/kallsyms.h>
 
 int panic_on_oops;
 int tainted;
@@ -292,6 +293,20 @@ void oops_exit(void)
 		(unsigned long long)oops_id);
 }
 
+#ifdef WANT_WARN_ON_SLOWPATH
+void warn_on_slowpath(const char *file, int line)
+{
+	char function[KSYM_SYMBOL_LEN];
+	unsigned long caller = (unsigned long) __builtin_return_address(0);
+
+	sprint_symbol(function, caller);
+	printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
+		line, function);
+	dump_stack();
+}
+EXPORT_SYMBOL(warn_on_slowpath);
+#endif
+
 #ifdef CONFIG_CC_STACKPROTECTOR
 /*
  * Called when gcc's -fstack-protector feature is used, and