linux-kernel - Re: [PATCH] pinctrl: at91-pio4: use %pr format string for resource

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Date:	Tue, 17 Nov 2015 14:33:41 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	<linux-gpio@...r.kernel.org>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: at91-pio4: use %pr format string for resource

Hi Arnd,

On Thu, Nov 12, 2015 at 03:15:38PM +0100, Arnd Bergmann wrote:
> resource_size_t may be defined as 32 or 64 bit depending on configuration,
> so it cannot be printed using the normal format strings, as gcc correctly
> warns:
> 
> pinctrl-at91-pio4.c: In function 'atmel_pinctrl_probe':
> pinctrl-at91-pio4.c:1003:41: warning: format '%u' expects argument of type 'unsigned int', but argument 5 has type 'resource_size_t {aka long long unsigned int}' [-Wformat=]
>    dev_dbg(dev, "bank %i: hwirq=%u\n", i, res->start);
> 
> This changes the format string to use the special "%pr" format
> string that prints a resource, and changes the arguments so we
> the resource structure directly. I'm also swapping out the arguments
> to match the text in the format string.
> 

I agree the format change but not swapping out the arguments. Why do you have
the feeling they are not matching the text?

Few lines before you have:
res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
atmel_pioctrl->irqs[i] = res->start;

Each bank has its own irq line this is what I want to print with hwirq.
Of course it assumes that interrupts are declared in the right order.

Regards

Ludovic

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
> index 33edd07d9149..23217e990eaf 100644
> --- a/drivers/pinctrl/pinctrl-at91-pio4.c
> +++ b/drivers/pinctrl/pinctrl-at91-pio4.c
> @@ -1000,7 +1000,7 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
>  		atmel_pioctrl->irqs[i] = res->start;
>  		irq_set_chained_handler(res->start, atmel_gpio_irq_handler);
>  		irq_set_handler_data(res->start, atmel_pioctrl);
> -		dev_dbg(dev, "bank %i: hwirq=%u\n", i, res->start);
> +		dev_dbg(dev, "bank %pr: hwirq=%u\n", res, i);
>  	}
>  
>  	atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
> 
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