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

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Message-ID: <BANLkTik5-H1fc2rk3QrwvQiF=7fELmE2CA@mail.gmail.com>
Date:	Thu, 16 Jun 2011 21:30:56 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Linux/m68k" <linux-m68k@...ts.linux-m68k.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: m68k: Convert to genirq (WIP)

On Wed, Jun 15, 2011 at 21:44, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Sat, Jun 4, 2011 at 19:56, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>> On Sat, May 28, 2011 at 20:32, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>>> Now sparc32 has beaten me, I pushed out my work in progress of converting m68k
>>> to use the generic hardirq framework:
>>>
>>> git://git.kernel.org:/pub/scm/linux/kernel/git/geert/linux-m68k.git m68k-genirq
>>> http://git.kernel.org/?p=linux/kernel/git/geert/linux-m68k.git;a=shortlog;h=refs/heads/m68k-genirq
>>
>>> Next on my list is Amiga, which will cover autovectored and chained interrupts.
>>
>> I rebased to 3.0-rc1 and added (not in that order):
>>  [10] m68k/irq: Add m68k_setup_irq_controller()
>>  [11] m68k/irq: Adding missing "irq" offset in m68k_setup_irq_controller()
>>  [12] m68k/irq: Fix auto and user chips and handlers
>>  [13] m68k/amiga: Refactor amiints.c
>>  [14] m68k/amiga: Convert Amiga to genirq
>>  [15] m68k/amiga: Optimize interrupts using chain handlers
>>
>> It works on Amiga now, too. It can still use some optimizations in the
>> irq_{enable,disable,ack,mask,mask_ack,unmask} area, as my BogoMIPS
>> rating dropped by ca 2.5% and is now under 16, for a 25 MHz 68040.
>
> Seems like everything (Atari/ARAnyM and Amiga) still works when using
> handle_simple_irq instead of handle_level_irq.
> As a bonus, BogoMIPS is above 16 again.

With handle_simple_irq(), we no longer need to define irq_{,un}mask() methods
in our irq_chips. Hence the "old" m68k platform interrupt code seems to be much
closer to genirq than I thought...

Does this make sense?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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