linux-kernel - Re: [PATCH 2/3] FRV: Permit __do

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Message-Id: <1158875982.26347.125.camel@localhost.localdomain>
Date:	Fri, 22 Sep 2006 07:59:42 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, torvalds@...l.org, akpm@...l.org,
	linux-kernel@...r.kernel.org, uclinux-dev@...inux.org
Subject: Re: [PATCH 2/3] FRV: Permit __do_IRQ() to be dispensed with

On Thu, 2006-09-21 at 14:12 +0100, David Howells wrote:
> Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> 
> > It can't optimize __do_IRQ() out in any case if one uses
> > generic_handle_irq() because of the test in there which can't be
> > predicted at compile time.
> 
> Do you realise that powerpc still uses __do_IRQ if CONFIG_IRQSTACKS=y?  You
> should probably fix that.

At the moment, there is no hurry as this code is shared with arch/ppc
which hasn't been ported to genirq, so we need to handle both cases.
(Though I'm not sure we ever get CONFIG_IRQSTACKS with arch/ppc ... I
should probably check). The code uses desc->handle_irq and falls back to
__do_IRQ() if that is NULL.

Ben.


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