linux-kernel - [patch] lockdep: improve lockdep

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Message-ID: <20061207092726.GA1103@elte.hu>
Date:	Thu, 7 Dec 2006 10:27:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...l.org>
Subject: [patch] lockdep: improve lockdep_reset()

Subject: [patch] lockdep: improve lockdep_reset()
From: Ingo Molnar <mingo@...e.hu>

clear all the chains during lockdep_reset(). This fixes
some locking-selftest false positives i saw on -rt. (never
saw those on mainline though, but it could happen.)

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/lockdep.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux/kernel/lockdep.c
===================================================================
--- linux.orig/kernel/lockdep.c
+++ linux/kernel/lockdep.c
@@ -2438,6 +2438,7 @@ EXPORT_SYMBOL_GPL(lock_release);
 void lockdep_reset(void)
 {
 	unsigned long flags;
+	int i;
 
 	raw_local_irq_save(flags);
 	current->curr_chain_key = 0;
@@ -2448,6 +2449,8 @@ void lockdep_reset(void)
 	nr_softirq_chains = 0;
 	nr_process_chains = 0;
 	debug_locks = 1;
+	for (i = 0; i < CHAINHASH_SIZE; i++)
+		INIT_LIST_HEAD(chainhash_table + i);
 	raw_local_irq_restore(flags);
 }
 

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