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Subject[PATCH -rt 1/9] preempt rcu: check for underflow
Simple WARN_ON to catch any underflow in rcu_read_lock_nesting.

Signed-off-by: Daniel Walker <dwalker@mvista.com>

---
kernel/rcupreempt.c | 6 ++++++
1 file changed, 6 insertions(+)
Index: linux-2.6.22/kernel/rcupreempt.c
===================================================================
--- linux-2.6.22.orig/kernel/rcupreempt.c
+++ linux-2.6.22/kernel/rcupreempt.c
@@ -157,6 +157,12 @@ void __rcu_read_unlock(void)
}

local_irq_restore(oldirq);
+
+ /*
+ * If our rcu_read_lock_nesting went negative, likely
+ * something is wrong..
+ */
+ WARN_ON(current->rcu_read_lock_nesting < 0);
}

static void __rcu_advance_callbacks(void)
--
-
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