Question about interrupts

On Fri, Jul 29, 2011 at 3:16 PM, manish honap
[off-list ref] wrote:

Hello all,

When interrupts are handled through interrupt gate cpu automatically clears IF
flag.

but to allow nesting kernel sets the IF flag in handle_irq_event - for 2.6.11

but in 2.6.39 how the interrupts are re-enabled so as to facilitate nesting of
interrupts
I am unable to find local_irq_enable in do_IRQ()

I think in handle_IRQ_event event again interrupts are enabled
if (!(action->flags & IRQF_DISABLED))
local_irq_enable_in_hardirq();

Thanks in advance.


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