linux-kernel - [PATCH 1/2] lockdep missing barrier()

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Date:	Tue, 16 Jan 2007 12:56:24 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	Andrew Morton <akpm@...l.org>, Greg Kroah-Hartman <gregkh@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, ltt-dev@...fik.org,
	"Martin J. Bligh" <mbligh@...igh.org>,
	Douglas Niehaus <niehaus@...s.ku.edu>,
	systemtap@...rces.redhat.com, Thomas Gleixner <tglx@...utronix.de>,
	Richard J Moore <richardj_moore@...ibm.com>
Subject: [PATCH 1/2] lockdep missing barrier()

This patch adds a barrier() to lockdep.c lockdep_recursion updates. This
variable behaves like the preemption count and should therefore use similar
memory barriers.

This patch applies on 2.6.20-rc4-git3.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>

--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -166,12 +166,14 @@ static struct list_head chainhash_table[CHAINHASH_SIZE];
 void lockdep_off(void)
 {
 	current->lockdep_recursion++;
+	barrier();
 }
 
 EXPORT_SYMBOL(lockdep_off);
 
 void lockdep_on(void)
 {
+	barrier();
 	current->lockdep_recursion--;
 }

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