linux-kernel - Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers

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Date:	Mon, 20 Nov 2006 17:42:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers


* Daniel Walker <dwalker@...sta.com> wrote:

> It makes porting to powerpc for instance harder because some 
> controllers have ack(), and some don't.. Some have mask(), and some 
> don't.. So you end up with what Sergei is doing which is flat out make 
> ack == eoi .. Where you have multiple irq chip types each one really 
> needs an individual evaluation ..

this isnt really a problem. The current situation is simply hacky, 
because right now there's no 'threaded' flow type at all. The x86 code 
just moves the code away from fasteoi:

 #ifdef CONFIG_PREEMPT_HARDIRQS
                set_irq_chip_and_handler_name(irq, &ioapic_chip,
                                            handle_level_irq, "level-threaded");#else
                set_irq_chip_and_handler_name(irq, &ioapic_chip,
                                              handle_fasteoi_irq, "fasteoi");
 #endif

what should happen is a handle_thread_irq irq-flow handler that will 
first mask, and then ack or eoi (whichever callbacks is available), and 
thus can and will handle both fasteoi, edge and level irqs.

	Ingo
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