linux-kernel - Re: [PATCH] video: xilinxfb: constify fb_fix_screeninfo and fb_var

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Date:   Mon, 10 Jul 2017 09:29:09 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Michal Simek <michal.simek@...inx.com>,
        Sören Brinkmann <soren.brinkmann@...inx.com>
CC:     <linux-fbdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] video: xilinxfb: constify fb_fix_screeninfo and
 fb_var_screeninfo structures

On 8.7.2017 03:24, Gustavo A. R. Silva wrote:
> These structures are only used to copy into other structures,
> so declare them as const.
> 
> This issue was detected using Coccinelle and the following semantic patch:
> 
> @r disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct fb_fix_screeninfo i@p = { ... };
> 
> @ok@
> identifier r.i;
> expression e;
> position p;
> @@
> e = i@p
> 
> @bad@
> position p != {r.p,ok.p};
> identifier r.i;
> struct fb_fix_screeninfo e;
> @@
> e@i@p
> 
> @depends on !bad disable optional_qualifier@
> identifier r.i;
> @@
> static
> +const
>  struct fb_fix_screeninfo i = { ... };
> 
> The semantic patch for fb_var_screeninfo is analogous.
> 
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
> ---
>  drivers/video/fbdev/xilinxfb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/fbdev/xilinxfb.c b/drivers/video/fbdev/xilinxfb.c
> index 17dc119..0bda18e 100644
> --- a/drivers/video/fbdev/xilinxfb.c
> +++ b/drivers/video/fbdev/xilinxfb.c
> @@ -110,14 +110,14 @@ static struct xilinxfb_platform_data xilinx_fb_default_pdata = {
>  /*
>   * Here are the default fb_fix_screeninfo and fb_var_screeninfo structures
>   */
> -static struct fb_fix_screeninfo xilinx_fb_fix = {
> +static const struct fb_fix_screeninfo xilinx_fb_fix = {
>  	.id =		"Xilinx",
>  	.type =		FB_TYPE_PACKED_PIXELS,
>  	.visual =	FB_VISUAL_TRUECOLOR,
>  	.accel =	FB_ACCEL_NONE
>  };
>  
> -static struct fb_var_screeninfo xilinx_fb_var = {
> +static const struct fb_var_screeninfo xilinx_fb_var = {
>  	.bits_per_pixel =	BITS_PER_PIXEL,
>  
>  	.red =		{ RED_SHIFT, 8, 0 },
> 

Acked-by: Michal Simek <michal.simek@...inx.com>

Thanks,
Michal