linux-kernel - [PATCH 1/3] Increase lockdep limits: MAX_STACK_TRACE

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Date:	Tue, 7 Jul 2009 16:25:03 +0100
From:	Joao Correia <joaomiguelcorreia@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Amerigo Wang <xiyou.wangcong@...il.com>, a.p.zijlstra@...llo.nl
Subject: [PATCH 1/3] Increase lockdep limits: MAX_STACK_TRACE_ENTRIES

(Applies to current Linus tree, as of 2.6.31-rc2)

As it stands now, the limit is too low and is being hit by false
positives. Increasing its value will allow for more room to work with.

This was suggested by Ingo Molnar
(http://article.gmane.org/gmane.linux.kernel/852005) but never
submitted as a patch, to the best of my knowledge.


Signed-off-by: Joao Correia <joaomiguelcorreia@...il.com>

---
 kernel/lockdep_internals.h | 2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/lockdep_internals.h b/kernel/lockdep_internals.h
index 699a2ac..93af1f1 100644
--- a/kernel/lockdep_internals.h
+++ b/kernel/lockdep_internals.h
@@ -65,7 +65,7 @@ enum {
  * Stack-trace: tightly packed array of stack backtrace
  * addresses. Protected by the hash_lock.
  */
-#define MAX_STACK_TRACE_ENTRIES	262144UL
+#define MAX_STACK_TRACE_ENTRIES	1048576UL

 extern struct list_head all_lock_classes;
 extern struct lock_chain lock_chains[];
---
--
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