linux-kernel - Re: [PATCH] pinctrl: qcom: msm: constify gpio

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Date:   Tue, 11 Jul 2017 14:41:51 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: qcom: msm: constify gpio_chip structure

On Tue 11 Jul 11:34 PDT 2017, Gustavo A. R. Silva wrote:
[..]
> In the following log you can see a significant difference in the code size
> and data segment, hence in the dec segment. This log is the output

"dec" is for "decimal" and is the sum of text, data and bss...

> of the size command, before and after the code change:
> 
> before:
>    text    data     bss     dec     hex filename
>   13129    2808     192   16129    3f01 drivers/pinctrl/qcom/pinctrl-msm.o
> 
> after:
>    text    data     bss     dec     hex filename
>   12839    2720     192   15751    3d87 drivers/pinctrl/qcom/pinctrl-msm.o
> 
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>

Good catch, thanks!

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/pinctrl/qcom/pinctrl-msm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 273badd..245ccfd 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -521,7 +521,7 @@ static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
>  #define msm_gpio_dbg_show NULL
>  #endif
>  
> -static struct gpio_chip msm_gpio_template = {
> +static const struct gpio_chip msm_gpio_template = {
>  	.direction_input  = msm_gpio_direction_input,
>  	.direction_output = msm_gpio_direction_output,
>  	.get_direction    = msm_gpio_get_direction,
> -- 
> 2.5.0
>