linux-kernel - [PATCH 2/3] Increase lockdep limits: MAX_LOCK

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Date:	Tue, 7 Jul 2009 16:25:08 +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 2/3] Increase lockdep limits: MAX_LOCK_DEPTH

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

As a result of increasing MAX_STACK_TRACE_ENTRIES on the previous
patch, another limit surfaced as being hit too soon.
This patch increases MAX_LOCK_DEPTH, being hit by false positives, and
turning off the locking correctness validator.

The new value is arbitrary, but I believe the old one was too. Given
the amount of changes happening with regards to the usage of lockdep,
the previous limit is just too low and keeping it that way would
defeat the purpose of lockdep.


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

---
 include/linux/sched.h |    2 +-
 1 files changes, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 0085d75..304231b 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1367,7 +1367,7 @@ struct task_struct {
        int softirq_context;
 #endif
 #ifdef CONFIG_LOCKDEP
-# define MAX_LOCK_DEPTH 48UL
+# define MAX_LOCK_DEPTH 96UL
        u64 curr_chain_key;
        int lockdep_depth;
        unsigned int lockdep_recursion;
---
--
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