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A doubt in local_bh_disable

Hi,

Might be very trivial but I have a doubt in local_bh_disable(). Why do we warn
if this function is called from top half  .i.e.

static void __local_bh_disable(unsigned long ip)
 {
         unsigned long flags;

         WARN_ON_ONCE(in_irq());

         raw_local_irq_save(flags);
  --- some more code ---

-- 
Best Regards,
Ranjan

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