linux-kernel - Re: [PATCH 2/2] gpio: do not call __gpio_xxx under !CONFIG

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Date:	Tue, 6 Nov 2012 13:27:29 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH 2/2] gpio: do not call __gpio_xxx under !CONFIG_GPIOLIB

On Sun, Nov 04, 2012 at 06:47:12PM +0100, Linus Walleij wrote:
> On Wed, Oct 31, 2012 at 8:00 AM, Yuanhan Liu
> <yuanhan.liu@...ux.intel.com> wrote:
> 
> > Those functions are availabe only when CONFIG_GPIOLIB is set. So, we
> > should not call them under !CONFIG_GPIOLIB block.
> >
> > This would fix following build errros:
> > include/asm-generic/gpio.h: In function 'gpio_get_value_cansleep':
> > include/asm-generic/gpio.h:220:2: error: implicit declaration of function '__gpio_get_value'
> > include/asm-generic/gpio.h: In function 'gpio_set_value_cansleep':
> > nclude/asm-generic/gpio.h:226:2: error: implicit declaration of function '__gpio_set_value'
> 
> OK...
> 
> >  static inline int gpio_get_value_cansleep(unsigned gpio)
> >  {
> > -       might_sleep();
Hi,

> 
> So why are you deleting this very useful might_sleep() runtime
> semantic check?

Yes, I should keep it. I did it because I saw the definition of
gpio_get_value at include/linux/gpio.h didn't call that function.

Will keep it in the next version together with the previous patch.
And sorry that it may take some time, as I'm occupied by other things :(

Thanks.

	--yliu
> 
> > -       return __gpio_get_value(gpio);
> > +       WARN_ON(1);
> > +       return 0;
> >  }
> >
> >  static inline void gpio_set_value_cansleep(unsigned gpio, int value)
> >  {
> > -       might_sleep();
> > -       __gpio_set_value(gpio, value);
> > +       WARN_ON(1);
> >  }
> 
> Yours,
> Linus Walleij
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