linux-kernel - Re: [PATCH 5/5] media: atomisp: get rid of -Wsuggest-attribute=format warnings

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Date:   Thu, 3 Sep 2020 17:07:24 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] media: atomisp: get rid of
 -Wsuggest-attribute=format warnings

On Thu, Sep 03, 2020 at 03:57:32PM +0200, Mauro Carvalho Chehab wrote:
> There are some warnings reported by gcc:
> 	drivers/staging/media/atomisp//pci/atomisp_compat_css20.c:164:2: warning: function ‘atomisp_css2_dbg_print’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
> 	drivers/staging/media/atomisp//pci/atomisp_compat_css20.c:170:2: warning: function ‘atomisp_css2_dbg_ftrace_print’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
> 	drivers/staging/media/atomisp//pci/atomisp_compat_css20.c:170:2: warning: function ‘atomisp_css2_dbg_ftrace_print’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
> 	drivers/staging/media/atomisp//pci/atomisp_compat_css20.c:176:2: warning: function ‘atomisp_css2_err_print’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
> 
> That are due to the usage of printf-like messages without
> enabling the error checking logic.
> 
> Add the proper attributes in order to shut up such warnings.

> +static int  __attribute__((format (printf, 1, 0)))
> +atomisp_css2_dbg_ftrace_print(const char *fmt, va_list args)
>  {
>  	ftrace_vprintk(fmt, args);
>  	return 0;
>  }
>  

Why not to drop it completely as well?

> -static int atomisp_css2_err_print(const char *fmt, va_list args)
> -{
> -	vprintk(fmt, args);
> -	return 0;
> -}


-- 
With Best Regards,
Andy Shevchenko