linux-kernel - Re: [PATCH v2] handle failure of irqchip->set_type in setup

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Message-Id: <20080704120837.573adc9c.akpm@linux-foundation.org>
Date:	Fri, 4 Jul 2008 12:08:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v2] handle failure of irqchip->set_type in setup_irq

On Fri, 4 Jul 2008 20:43:07 +0200 Uwe Kleine-K__nig <Uwe.Kleine-Koenig@...i.com> wrote:

> >                                            I wonder if we can do better.
> > Let me think about that.
> I was about to suggest something like:
> 
> 	/* WARNING: this returns a static pointer, so you cannot use the
> 	 * returned value after another call to creative_function_name
> 	 */
> 	char *creative_function_name(void *addr)
> 	{
> 		static char buf[SOME_LENGTH];
> 
> 		... format symbol name into buf ...
> 
> 		return buf;
> 	}
> 
> Then I could have used
> 
> 	pr_err("setting flow type for irq %u failed (%s)\n",
> 			irq, creative_function_name(chip->set_type));
> 
> which looks definitely nicer.

Better would be

	char buf[ENOUGH /* rofl */];

	pr_err("setting flow type for irq %u failed (%s)\n",
			irq, render_function_name(buf, chip->set_type));

However I'm presently brewing up a plot to do this:

	printk("function name is %Ss\n", (unsigned long *)chip->set_type);

which I think will work.  We can also do

	printk("IP address is %Si\n", (unsigned long *)ip_address_buffer);

to replace NIPQUAD.  And similar printk extensions.

Am still thinking about it though.
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