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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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