linux-kernel - Re: [patch 2.6.20-rc1 4/6] PXA GPIO wrappers

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Date:	Thu, 21 Dec 2006 11:25:47 -0800
From:	David Brownell <david-b@...bell.net>
To:	"pHilipp Zabel" <philipp.zabel@...il.com>
Cc:	"Nicolas Pitre" <nico@....org>, "Andrew Morton" <akpm@...l.org>,
	"Linux Kernel list" <linux-kernel@...r.kernel.org>,
	"Andrew Victor" <andrew@...people.com>,
	"Bill Gatliff" <bgat@...lgatliff.com>,
	"Haavard Skinnemoen" <hskinnemoen@...el.com>, jamey.hicks@...com,
	"Kevin Hilman" <khilman@...sta.com>,
	"Russell King" <rmk@....linux.org.uk>,
	"Tony Lindgren" <tony@...mide.com>
Subject: Re: [patch 2.6.20-rc1 4/6] PXA GPIO wrappers

On Thursday 21 December 2006 7:03 am, pHilipp Zabel wrote:
> On 12/21/06, Nicolas Pitre <nico@....org> wrote:

> +static inline void __gpio_set_value(unsigned gpio, int value)
> +{
> +	if (value)
> +		GPSR(gpio) = GPIO_bit(gpio);
> +	else
> +		GPCR(gpio) = GPIO_bit(gpio);
> +}
> +
> +#define gpio_set_value(gpio,value)		\
> +	(__builtin_constant_p(gpio) ?		\

Should that be testing for _both_ gpio and value being constant?
I tend to think it should (assuming nonconstant 'variable' means
this costs more than a function call) ...

> +	 __gpio_set_value(gpio, value) :	\
> +	 pxa_gpio_set_value(gpio, value))
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