linux-kernel - Re: [PATCH] irq: move some interrupt arch_* functions into struct irq

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Message-ID: <86802c441003100406t70dd854fx491f0ee9a6fce62b@mail.gmail.com>
Date:	Wed, 10 Mar 2010 04:06:14 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	ijc@...lion.org.uk
Cc:	linux-kernel@...r.kernel.org,
	Ian Campbell <ian.campbell@...rix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, x86@...nel.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH] irq: move some interrupt arch_* functions into struct 
	irq_chip.

On Wed, Mar 10, 2010 at 2:55 AM,  <ijc@...lion.org.uk> wrote:
> From: Ian Campbell <ian.campbell@...rix.com>
>
> Move arch_init_copy_chip_data and arch_free_chip_data into function
> pointers in struct irq_chip since they operate on irq_desc->chip_data.
>
> arch_init_chip_data cannot be moved into struct irq_chip at this time
> because irq_desc->chip is not known at the time the irq_desc is
> setup. For now rename arch_init_chip_data to arch_init_irq_desc (for
> PowerPC, the only other user, whose usage better matches the new name)
> and on x86 convert arch_init_chip_data to ioapic_init_chip_data and
> call this whenever the IO APIC code allocates a new IRQ.
>
> I've retained the chip_data behaviour for uv_irq although it isn't
> clear to me if these interrupt types support migration or how closely
> related to the APIC modes they really are. If it weren't for this the
> ioapic_{init,copy,free}_chip_data functions could be static to
> io_apic.c.
>
> I've tested by booting on a 64 bit system, but it's not clear to me
> what actions I need to take to actually exercise some of these code
> paths.
>

can you just add another pointer field in irq_desc?

some kind of *irq_info etc.

YH
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