linux-kernel - Re: [PATCH] asm-generic/gpio.h: add some forward decls of the device struct

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Date:	Wed, 16 Dec 2009 14:30:32 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Frysinger <vapier@...too.org>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] asm-generic/gpio.h: add some forward decls of the
 device struct

On Wed,  9 Dec 2009 06:53:39 -0500
Mike Frysinger <vapier@...too.org> wrote:

> After the recent commit a4177ee7f, attempting to include asm-generic/gpio.h
> in otherwise "slim" code results in ugly warnings like so:
> 
>   CC      arch/blackfin/kernel/bfin_gpio.o
> In file included from arch/blackfin/include/asm/gpio.h:278,
>                  from arch/blackfin/kernel/bfin_gpio.c:15:
> include/asm-generic/gpio.h:193: warning:
> ___struct device___ declared inside parameter list
> its scope is only this definition or declaration, which is probably not what you want
> 
> So add simple C forward decls of the struct device to avoid these.
> 
> Signed-off-by: Mike Frysinger <vapier@...too.org>
> ---
>  include/asm-generic/gpio.h |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
> index 66d6106..204bed3 100644
> --- a/include/asm-generic/gpio.h
> +++ b/include/asm-generic/gpio.h
> @@ -28,6 +28,7 @@ static inline int gpio_is_valid(int number)
>  	return ((unsigned)number) < ARCH_NR_GPIOS;
>  }
>  
> +struct device;
>  struct seq_file;
>  struct module;
>  
> @@ -181,6 +182,8 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value)
>  
>  #ifndef CONFIG_GPIO_SYSFS
>  
> +struct device;
> +
>  /* sysfs support is only available with gpiolib, where it's optional */
>  
>  static inline int gpio_export(unsigned gpio, bool direction_may_change)

There was no need to add duplicated forward declarations.  Just move
them all to the top, outside ifdefs.
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