linux-kernel - Re: irqnr fallout in gpiolib on sparc32

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Date:	Mon, 5 Jan 2009 14:48:32 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Yinghai Lu <yinghai@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	sparclinux <sparclinux@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: irqnr fallout in gpiolib on sparc32

On Mon, Jan 05, 2009 at 02:38:19PM +0100, Ingo Molnar wrote:
> 
> * Sam Ravnborg <sam@...nborg.org> wrote:
> 
> > I hit the following build error on sparc:
> > 
> > drivers/gpio/gpiolib.c: In function `gpiolib_dbg_show':
> > drivers/gpio/gpiolib.c:1146: error: implicit declaration of function `irq_to_desc'
> > drivers/gpio/gpiolib.c:1146: warning: initialization makes pointer from integer without a cast
> > 
> > 
> > This is with an allmodconfig where I did:
> > 
> > make ARCH=sparc vmlinux
> > 
> > sparc do _not_ have GENERIC_HARDIRQS set to 'y'.
> >
> > I did a simple:
> > #include <linux/irqnr.h> but that did not help.
> 
> yeah. Does the patch below do the trick?

Needed a small fix - see below.

> 
> btw., i'm curious, does the unification of the sparc architectures mean 
> that sparc32 will be using genirq too some time in the future?

Dave has mentioned this but we are not working actively on it yet.

> 
> 	Ingo
> 
> ---------------->
> From 08522e214542b4afc6c2401bb02900cfca76f600 Mon Sep 17 00:00:00 2001
> From: Ingo Molnar <mingo@...e.hu>
> Date: Mon, 5 Jan 2009 14:34:42 +0100
> Subject: [PATCH] genirq: provide irq_to_desc() to non-genirq architectures too
> 
> Impact: build fix on non-genirq architectures
> 
> Sam Ravnborg reported this build failure on sparc32 allmodconfig,
> the GPIO drivers assume the presence of irq_to_desc():
> 
>  drivers/gpio/gpiolib.c: In function `gpiolib_dbg_show':
>  drivers/gpio/gpiolib.c:1146: error: implicit declaration of function 'irq_to_desc'
> 
> Add it in the !genirq case too.
> 
> Reported-by: Sam Ravnborg <sam@...nborg.org>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  include/linux/irqnr.h |    7 ++++++-
>  1 files changed, 6 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/irqnr.h b/include/linux/irqnr.h
> index 5504a5c..6b719fa 100644
> --- a/include/linux/irqnr.h
> +++ b/include/linux/irqnr.h
> @@ -8,7 +8,12 @@
>  
>  #ifndef CONFIG_GENERIC_HARDIRQS
>  #include <asm/irq.h>
> -# define nr_irqs		NR_IRQS
> +
> +/*
> + * Wrappers for non-genirq architectures:
> + */
> +#define nr_irqs			NR_IRQS
> +#define irq_to_desc(irq)	irq_desc[irq]

irq_to_desc(irq) return a pointer to a struct irq_desc
so we need to take the address.

> +#define irq_to_desc(irq)	&irq_desc[irq]
                                ^
With this small fix the build continues.

Thanks,
	Sam
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