From 74f4e369fc5b52433ad824cef32d3bf1304549be Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 12 May 2008 21:21:15 +0200
Subject: ftrace: stacktrace fix

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/semaphore.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'kernel/semaphore.c')

diff --git a/kernel/semaphore.c b/kernel/semaphore.c
index 5c2942e768c..1a064adab65 100644
--- a/kernel/semaphore.c
+++ b/kernel/semaphore.c
@@ -31,6 +31,7 @@
 #include <linux/sched.h>
 #include <linux/semaphore.h>
 #include <linux/spinlock.h>
+#include <linux/ftrace.h>
 
 static noinline void __down(struct semaphore *sem);
 static noinline int __down_interruptible(struct semaphore *sem);
@@ -53,6 +54,7 @@ void down(struct semaphore *sem)
 {
 	unsigned long flags;
 
+	ftrace_special(sem->count, 0, __LINE__);
 	spin_lock_irqsave(&sem->lock, flags);
 	if (likely(sem->count > 0))
 		sem->count--;
-- 
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