irq_desc?

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Hi all,
I'm using irq_decs[NR_IRQS] directly in my module
which is define in linux/irq.h  file as
extern irq_desc_t irq_desc

can't we used this directly in module for used 
like 
 irq_desc[n]=my_handler
instead of making some request   and registering
handlers,
especially requires when one wants to do some work
with
by replacing handler say irq0 which is used by timer
for some time,
this requires in pcsp and even for stepper motor 
to triggering interrupt  at irq0

but my module is not working
it's saying
unresolved symbol irq_desc
plz help

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