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

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Date:	Thu, 11 Mar 2010 09:07:18 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	ijc@...lion.org.uk
Cc:	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ian Campbell <ian.campbell@...rix.com>, x86@...nel.org,
	linuxppc-dev@...abs.org, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.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:
> 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.

Ack on the name change, it should be called arch_init_irq_desc(), the
existing name clearly comes from the fact that sparse IRQ was
implemented first on x86, and on x86 that routine init's the chip data
for a new irq_desc.

But semantically arch_init_irq_desc() is the right name, I was just too
lazy to change it when I enabled sparse IRQ for powerpc.

Can't comment on the rest of the patch.

cheers


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