linux-kernel - Re: [PATCH] input: surface3_spi: make const array header static, reduces object code size

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Date:   Thu, 7 Sep 2017 14:31:56 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     linux-input@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: surface3_spi: make const array header static,
 reduces object code size

On Wed, Sep 06, 2017 at 10:51:37AM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Don't populate the const array header on the stack, instead make it
> static.  Makes the object code smaller by over 180 bytes:
> 
> Before:
>    text	   data	    bss	    dec	    hex	filename
>    6003	   1536	      0	   7539	   1d73	surface3_spi.o
> 
> After:
>    text	   data	    bss	    dec	    hex	filename
>    5726	   1632	      0	   7358	   1cbe	surface3_spi.o
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---

Applied, thank you.

>  drivers/input/touchscreen/surface3_spi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/touchscreen/surface3_spi.c b/drivers/input/touchscreen/surface3_spi.c
> index e12fb9b63f31..ecba847889b5 100644
> --- a/drivers/input/touchscreen/surface3_spi.c
> +++ b/drivers/input/touchscreen/surface3_spi.c
> @@ -173,7 +173,7 @@ static void surface3_spi_process_pen(struct surface3_ts_data *ts_data, u8 *data)
>  
>  static void surface3_spi_process(struct surface3_ts_data *ts_data)
>  {
> -	const char header[] = {
> +	static const char header[] = {
>  		0xff, 0xff, 0xff, 0xff, 0xa5, 0x5a, 0xe7, 0x7e, 0x01
>  	};
>  	u8 *data = ts_data->rd_buf;
> -- 
> 2.14.1
> 

-- 
Dmitry