lockdep-RT-recursion-limit-fix.patch

From 026888d186defa1fe305dd47c30345a98f87058e Mon Sep 17 00:00:00 2001
From: Steven Rostedt <rostedt@goodmis.org>
Date: Fri, 3 Jul 2009 08:44:07 -0500
Subject: [PATCH] lockdep: RT recursion limit fix

commit 3b1dbf9875d464a0d29c3deac45ae3018eee3f16 in tip.

OK, I sent this out once before but it must have slipped under the radar.
http://lkml.org/lkml/2007/6/28/325

My config fails miserably with lockdep:

kernel/lockdep.c: In function 'find_usage_forwards':
kernel/lockdep.c:814: error: 'RECURSION_LIMIT' undeclared (first use in
this function)
kernel/lockdep.c:814: error: (Each undeclared identifier is reported only
once
kernel/lockdep.c:814: error: for each function it appears in.)
kernel/lockdep.c:815: warning: implicit declaration of function
'print_infinite_recursion_bug'
kernel/lockdep.c: In function 'find_usage_backwards':
kernel/lockdep.c:856: error: 'RECURSION_LIMIT' undeclared (first use in
this function)
make[1]: *** [kernel/lockdep.o] Error 1

But this patch fixes it nicely.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index c62ec14..cf6db46 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -1337,6 +1337,7 @@ print_shortest_lock_dependencies(struct lock_list *leaf,
 	return;
 }
 
+#ifdef CONFIG_PROVE_LOCKING
 static int
 print_bad_irq_dependency(struct task_struct *curr,
 			 struct lock_list *prev_root,
@@ -1407,6 +1408,7 @@ print_bad_irq_dependency(struct task_struct *curr,
 
 	return 0;
 }
+#endif /* CONFIG_PROVE_LOCKING */
 
 static int
 check_usage(struct task_struct *curr, struct held_lock *prev,
-- 
1.7.1.1