Hi, Paul
        I have a question to the srcu_read_lock(). Can it be invoked on 
interrupt context? According to 
http://lxr.free-electrons.com/source/kernel/rcu/srcu.c#L292 it can only be 
called from process context, but according to 
http://lxr.free-electrons.com/source/include/linux/srcu.h#L213 seems it's ok 
from irq context only if it matches with the srcu_read_unlock. Can you 
please give some hints?

Thanks
--jyh
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