linux-kernel - Re: [PATCH 3/3] gpiolib: add __must_check attribute to the gpiochip

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Message-Id: <200803111402.38671.david-b@pacbell.net>
Date:	Tue, 11 Mar 2008 13:02:38 -0800
From:	David Brownell <david-b@...bell.net>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] gpiolib: add __must_check attribute to the gpiochip_add function

On Tuesday 11 March 2008, Anton Vorontsov wrote:
> 
> Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>

I'm curious why you want to change this.   When it fails, a
KERN_ERR message is emitted ... if you're going to insist
that callers handle this -- e.g. platform setup code might
use a "WARN_ON(gpiochip_add(...) < 0)" -- why not take out
that KERN_ERR mechanism too?

NAK unless it comes with a patch to update all callers to do
that checking, so that this isn't just "add build warnings".
But I'm not sure I like these attributes in cases like this.

- Dave



> ---
>  drivers/gpio/gpiolib.c     |    2 +-
>  include/asm-generic/gpio.h |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 2149e0c..851eb4d 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -161,7 +161,7 @@ static int gpiochip_find_base(int ngpio)
>   * because the chip->base is invalid or already associated with a
>   * different chip.  Otherwise it returns zero as a success code.
>   */
> -int gpiochip_add(struct gpio_chip *chip)
> +int __must_check gpiochip_add(struct gpio_chip *chip)
>  {
>  	unsigned long	flags;
>  	int		status = 0;
> diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
> index 20f5d67..51ed230 100644
> --- a/include/asm-generic/gpio.h
> +++ b/include/asm-generic/gpio.h
> @@ -77,7 +77,7 @@ extern const char *gpiochip_is_requested(struct gpio_chip *chip,
>  extern int __must_check gpiochip_reserve(int start, int ngpio);
>  
>  /* add/remove chips */
> -extern int gpiochip_add(struct gpio_chip *chip);
> +extern int __must_check gpiochip_add(struct gpio_chip *chip);
>  extern int __must_check gpiochip_remove(struct gpio_chip *chip);
>  
>  
> -- 
> 1.5.2.2
> 


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