linux-kernel - Re: m68k: Convert to genirq (WIP)

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Date:	Fri, 26 Aug 2011 21:21:05 +1000 (EST)
From:	Finn Thain <fthain@...egraphics.com.au>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
cc:	Brad Boyer <flar@...andria.com>,
	Linux/m68k <linux-m68k@...ts.linux-m68k.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: m68k: Convert to genirq (WIP)


On Fri, 26 Aug 2011, Geert Uytterhoeven wrote:

> On Wed, Aug 10, 2011 at 12:53, Finn Thain <fthain@...egraphics.com.au> wrote:
> >> via1_irq
> >>     OSS_IRQLEV_VIA1 = IRQ_AUTO_6 (on oss)       conflict: psc_irq
> >>
> >>     IRQ_AUTO_1                                  conflict: iop_ism_irq
> 
> >> iop_ism_irq
> >>     OSS_IRQLEV_IOPISM = 1 = IRQ_AUTO_1 (on oss) conflict: via1_irq
> >
> > via1_irq is remapped to IRQ_AUTO_6 on OSS.
> 
> According to via_register_interrupts(), it requests both:
> 
>         if (via_alt_mapping) {
>                 if (request_irq(IRQ_AUTO_1, via1_irq, 0, "software",
>                                 (void *)via1))
>                         pr_err("Couldn't register %s interrupt\n", "software");
>                 if (request_irq(IRQ_AUTO_6, via1_irq, 0, "via1", (void *)via1))
>                         pr_err("Couldn't register %s interrupt\n", "via1");
>         } else {
>                 if (request_irq(IRQ_AUTO_1, via1_irq, 0, "via1", (void *)via1))
>                         pr_err("Couldn't register %s interrupt\n", "via1");
>         }
> 
> Hence IRQ_AUTO_1 must be shared and we cannot use an optimized chain
> handler for via1_irq()

I'm pretty sure that the "software" request_irq can be removed. It has 
come up before --
http://marc.info/?l=linux-mac68k&m=110973724208746&w=2

Maybe Brad can shed some light on this (?)

I've just cloned and built your m68k-genirq branch. I will run some tests.

> nor iop_ism_irq().

via_register_interrupts() is not called on OSS.

Finn

> This is the only remaining conflict I see.
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
>