[PATCH 1/2] lockdep missing barrier()

[Mathieu Desnoyers]

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@xxxxxxxxxx>

--- 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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