relocate-DEBUG_LOCKS_WARN_ON-for-mutexes.patch

From 8c65176bc2e7a6085576e6e2c6c05cc0045f1e7c Mon Sep 17 00:00:00 2001
From: Paul Gortmaker <paul.gortmaker@windriver.com>
Date: Sun, 23 Jan 2011 14:07:02 -0500
Subject: [PATCH] relocate DEBUG_LOCKS_WARN_ON for mutexes

This is one of several extractions from the merge up to 33-rc8.

See it in a git tip repo with:

   git diff 5f854cfc024622e4aae14d7cf422f6ff86278688^2 \
	5f854cfc024622e4aae14d7cf422f6ff86278688 \
	kernel/mutex-debug.h kernel/mutex.c

You can find the origin of this change in the tip merge commit:

     commit 5f854cfc024622e4aae14d7cf422f6ff86278688
     Merge: cc24da0 4ec62b2
     Author: Thomas Gleixner <tglx@linutronix.de>
     Date:   Sun Feb 21 20:17:22 2010 +0100

         Forward to 2.6.33-rc8

         Merge branch 'linus' into rt/head with a pile of conflicts.

         Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Normally there are not significant changes/additions in a merge commit that
are not from any other "normal" commit.  But in this case there are, so
break them out into separate explicit commits.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/kernel/mutex-debug.h b/kernel/mutex-debug.h
index 57d527a..6dc57dd 100644
--- a/kernel/mutex-debug.h
+++ b/kernel/mutex-debug.h
@@ -41,7 +41,6 @@ static inline void mutex_clear_owner(struct mutex *lock)
 	do {						\
 		struct mutex *l = container_of(lock, struct mutex, wait_lock); \
 							\
-		DEBUG_LOCKS_WARN_ON(in_interrupt());	\
 		local_irq_save(flags);			\
 		arch_spin_lock(&(lock)->rlock.raw_lock);\
 		DEBUG_LOCKS_WARN_ON(l->magic != l);	\
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 432607a..e23f35e 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -149,6 +149,8 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
 	preempt_disable();
 	mutex_acquire(&lock->dep_map, subclass, 0, ip);
 
+	DEBUG_LOCKS_WARN_ON(in_interrupt());
+
 #ifdef CONFIG_MUTEX_SPIN_ON_OWNER
 	/*
 	 * Optimistic spinning.
-- 
1.7.1.1