linux-kernel - Re: [PATCH] gpio: 104-idi-48e: make array register

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Date:   Sun, 6 Oct 2019 11:07:59 -0400
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-gpio@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: 104-idi-48e: make array register_offset static,
 makes object smaller

On Sun, Oct 06, 2019 at 03:42:56PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Don't populate the array register_offset on the stack but instead make it
> static. Makes the object code smaller by 63 bytes.  Also add the int type
> specifier to clean up a checkpatch warning.
> 
> Before:
>    text	   data	    bss	    dec	    hex	filename
>    9212	   5712	   1408	  16332	   3fcc	drivers/gpio/gpio-104-idi-48.o
> 
> After:
>    text	   data	    bss	    dec	    hex	filename
>    9085	   5776	   1408	  16269	   3f8d	drivers/gpio/gpio-104-idi-48.o
> 
> (gcc version 9.2.1, amd64)
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/gpio/gpio-104-idi-48.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
> index ff53887bdaa8..c95c93ec0bd7 100644
> --- a/drivers/gpio/gpio-104-idi-48.c
> +++ b/drivers/gpio/gpio-104-idi-48.c
> @@ -65,7 +65,7 @@ static int idi_48_gpio_get(struct gpio_chip *chip, unsigned offset)
>  {
>  	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
>  	unsigned i;
> -	const unsigned register_offset[6] = { 0, 1, 2, 4, 5, 6 };
> +	static const unsigned int register_offset[6] = { 0, 1, 2, 4, 5, 6 };
>  	unsigned base_offset;
>  	unsigned mask;
>  
> -- 
> 2.20.1

Acked-by: William Breathitt Gray <vilhelm.gray@...il.com>