Second, because kernel preemptions (preempting when the interrupt handler would of returned to kernel space) can only occur when preempt_count==0. If it is nonzero, then we cannot preempt. So we check for the state "need_resched!=0 and preempt_count==0" at the end of all interrupts.
Robert Love
But, why it is initialised to 1. Then preempion is disabled for it. Does it do preempt_enable after initialization.
also, is need_sched is repalced by TIF_NEED_RESCHED flag?
thanks
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