Fw: Question about interrupts

[manish honap]

Well 2.6.39 seems to have changed and the flow as I understand for interrupt 
processing is
do_IRQ -> irq_enter -> handle_irq -> ...

but in above flow i cant find local_irq_enable anywhere; is there some different 
trick used to enable the interrupts ?




----- Forwarded Message ----
From: santhosh kumars <karuna.linux at gmail.com>
To: manish honap <manish_honap_vit at yahoo.co.in>
Cc: kernelnewbies at kernelnewbies.org
Sent: Fri, 29 July, 2011 3:31:10 PM
Subject: Re: Question about interrupts

On Fri, Jul 29, 2011 at 3:16 PM, manish honap
<manish_honap_vit at yahoo.co.in> 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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