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

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Date:	Wed, 10 Mar 2010 11:00:32 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linuxppc-dev@...abs.org" <linuxppc-dev@...abs.org>
Subject: Re: [PATCH] irq: move some interrupt arch_* functions into struct
 irq_chip.

On Wed, 2010-03-10 at 10:55 +0000, ijc@...lion.org.uk wrote:
> 
> 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.

One idea I had to improve this was to add a struct irq_chip * as a
parameter to irq_to_desc_alloc_node. The new parameter potentially could
be NULL for current behaviour. Does that sound like a reasonable
approach?

Ian.

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