linux-kernel - Re: [PATCH] auxdisplay: constify charlcd

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Message-ID: <1500050355.29303.10.camel@linux.intel.com>
Date:   Fri, 14 Jul 2017 19:39:15 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>,
        gregkh@...uxfoundation.org, miguel.ojeda.sandonis@...il.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] auxdisplay: constify charlcd_ops.

On Fri, 2017-07-14 at 22:04 +0530, Arvind Yadav wrote:
> charlcd_ops are not supposed to change at runtime. All functions
> working with charlcd_ops provided by <misc/charlcd.h> work with
> const charlcd_ops. So mark the non-const structs as const.
> 
> File size before:
>    text	   data	    bss	    dec	    hex	
> filename
>   12750	    560	    362	  13672	   3568	
> drivers/auxdisplay/panel.o
> 
> File size After adding 'const':
>    text	   data	    bss	    dec	    hex	
> filename
>   12942	    368	    362	  13672	   3568	
> drivers/auxdisplay/panel.o
> 

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

(As long as it has been compile tested)

> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>  drivers/auxdisplay/panel.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
> index 7a8b8fb..df126dc 100644
> --- a/drivers/auxdisplay/panel.c
> +++ b/drivers/auxdisplay/panel.c
> @@ -877,21 +877,21 @@ static void lcd_clear_fast_tilcd(struct charlcd
> *charlcd)
>  	spin_unlock_irq(&pprt_lock);
>  }
>  
> -static struct charlcd_ops charlcd_serial_ops = {
> +static const struct charlcd_ops charlcd_serial_ops = {
>  	.write_cmd	= lcd_write_cmd_s,
>  	.write_data	= lcd_write_data_s,
>  	.clear_fast	= lcd_clear_fast_s,
>  	.backlight	= lcd_backlight,
>  };
>  
> -static struct charlcd_ops charlcd_parallel_ops = {
> +static const struct charlcd_ops charlcd_parallel_ops = {
>  	.write_cmd	= lcd_write_cmd_p8,
>  	.write_data	= lcd_write_data_p8,
>  	.clear_fast	= lcd_clear_fast_p8,
>  	.backlight	= lcd_backlight,
>  };
>  
> -static struct charlcd_ops charlcd_tilcd_ops = {
> +static const struct charlcd_ops charlcd_tilcd_ops = {
>  	.write_cmd	= lcd_write_cmd_tilcd,
>  	.write_data	= lcd_write_data_tilcd,
>  	.clear_fast	= lcd_clear_fast_tilcd,

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy