linux-kernel - Re: [PATCH] media: staging: rkisp1: rsz: make const array static, makes object smaller

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Message-ID: <07b92ab9-bade-623e-395d-89320d9f88f6@collabora.com>
Date:   Tue, 20 Oct 2020 18:23:52 +0200
From:   Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
To:     Colin King <colin.king@...onical.com>,
        Helen Koike <helen.koike@...labora.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: staging: rkisp1: rsz: make const array static,
 makes object smaller

Hi, thanks,

Am 20.10.20 um 16:46 schrieb Colin King:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Don't populate the const array dev_names on the stack but instead it
> static. Makes the object code smaller by 15 bytes.
> 
> Before:
>     text	   data	    bss	    dec	    hex	filename
>    17091	   2648	     64	  19803	   4d5b	media/rkisp1/rkisp1-resizer.o
> 
> After:
>     text	   data	    bss	    dec	    hex	filename
>    17012	   2712	     64	  19788	   4d4c	media/rkisp1/rkisp1-resizer.o

On the other hand the data segment is 64 bytes bigger.
I don't know what is more important to save.
Anyway, the rkisp1-capture.c does the same with the names
so it is better to be consistent.

Thanks,
Dafna

> 
> (gcc version 10.2.0)
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   drivers/staging/media/rkisp1/rkisp1-resizer.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/media/rkisp1/rkisp1-resizer.c b/drivers/staging/media/rkisp1/rkisp1-resizer.c
> index 1687d82e6c68..7ca5b47c5bf5 100644
> --- a/drivers/staging/media/rkisp1/rkisp1-resizer.c
> +++ b/drivers/staging/media/rkisp1/rkisp1-resizer.c
> @@ -763,8 +763,10 @@ static void rkisp1_rsz_unregister(struct rkisp1_resizer *rsz)
>   
>   static int rkisp1_rsz_register(struct rkisp1_resizer *rsz)
>   {
> -	const char * const dev_names[] = {RKISP1_RSZ_MP_DEV_NAME,
> -					  RKISP1_RSZ_SP_DEV_NAME};
> +	static const char * const dev_names[] = {
> +		RKISP1_RSZ_MP_DEV_NAME,
> +		RKISP1_RSZ_SP_DEV_NAME
> +	};
>   	struct media_pad *pads = rsz->pads;
>   	struct v4l2_subdev *sd = &rsz->sd;
>   	int ret;
>