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How to find out which softirq I am running in.

Hi, 
I noticed that there are four/five softirq's defined in
kernel/softirq.c, How can I know which softirq am I called from, if at
all I am called from a softirq. I tried using in_softirq, but that
gives me the current->preempt_count, which is something like 256 or
1024. Where I just want to know of the NET_TX_SOFTIRQ, TIMER_SOFTIRQ,
NET_RX_SOFTIRQ, which one am I called from.
Thanks in advance.
-- 
Regards,
Devesh Agrawal

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