linux-kernel - Re: [PATCH] media: platform: allegro-dvt: Constify struct regmap

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Date: Wed, 8 May 2024 11:00:21 +0200
From: Michael Tretter <m.tretter@...gutronix.de>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: Re: [PATCH] media: platform: allegro-dvt: Constify struct
 regmap_config

On Sun, 05 May 2024 09:28:25 +0200, Christophe JAILLET wrote:
> 'allegro_regmap_config' and 'allegro_sram_config' are not modified in this
> diver and are only used as a const struct regmap_config.
> 
> Constifying these structures moves some data to a read-only section, so
> increase overall security.
> 
> On a x86_64, with allmodconfig:
> Before:
>    text	   data	    bss	    dec	    hex	filename
>   79587	   3706	    116	  83409	  145d1	drivers/media/platform/allegro-dvt/allegro-core.o
> 
> After:
>    text	   data	    bss	    dec	    hex	filename
>   80219	   3066	    116	  83401	  145c9	drivers/media/platform/allegro-dvt/allegro-core.o
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Reviewed-by: Michael Tretter <m.tretter@...gutronix.de>

> ---
>  drivers/media/platform/allegro-dvt/allegro-core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/allegro-dvt/allegro-core.c b/drivers/media/platform/allegro-dvt/allegro-core.c
> index da61f9beb6b4..1a19fef62e81 100644
> --- a/drivers/media/platform/allegro-dvt/allegro-core.c
> +++ b/drivers/media/platform/allegro-dvt/allegro-core.c
> @@ -179,7 +179,7 @@ struct allegro_dev {
>  	struct list_head channels;
>  };
>  
> -static struct regmap_config allegro_regmap_config = {
> +static const struct regmap_config allegro_regmap_config = {
>  	.name = "regmap",
>  	.reg_bits = 32,
>  	.val_bits = 32,
> @@ -188,7 +188,7 @@ static struct regmap_config allegro_regmap_config = {
>  	.cache_type = REGCACHE_NONE,
>  };
>  
> -static struct regmap_config allegro_sram_config = {
> +static const struct regmap_config allegro_sram_config = {
>  	.name = "sram",
>  	.reg_bits = 32,
>  	.val_bits = 32,
> -- 
> 2.45.0
> 
>