linux-kernel - Re: [PATCH] irqchip: Add support for ARMv7-M's NVIC

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Date:	Tue, 12 Mar 2013 20:27:02 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] irqchip: Add support for ARMv7-M's NVIC

On Tue, Mar 12, 2013 at 04:01:01PM +0000, Russell King - ARM Linux wrote:
> On Tue, Mar 12, 2013 at 04:54:33PM +0100, Uwe Kleine-König wrote:
> > +#include <asm/irq.h>
> > +#include <asm/io.h>
> 
> linux/io.h
> 
> > +	unsigned int irqs, i, irq_base;
> > +
> > +	irq_base = irq_alloc_descs(-1, 16, irqs - 16, numa_node_id());
> > +	if (IS_ERR_VALUE(irq_base)) {
> 
> Erm... irq_alloc_descs() returns a negative number on error.
> 
> 	if ((int)irq_base < 0)
> 
> or make irq_base an int, and use:
> 
> 	if (irq_base < 0)
Just for me: So the check using IS_ERR_VALUE is as wrong as the other
occurences in arch/arm that you just kicked out or is it just ugly?

I thought about it and went the "make irq_base int" route (and even
fixed the asm includes) even before I sent my patch. Just failed to pass
the right hash to format-patch after rebasing :-|

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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