linux-kernel - Re: [PATCH] platform/chrome: cros_usbpd_logger: Add __printf annotation to append

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Date:   Mon, 4 May 2020 14:00:04 -0700
From:   Benson Leung <bleung@...gle.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        groeck@...omium.org, bleung@...omium.org, dtor@...omium.org,
        gwendal@...omium.org
Subject: Re: [PATCH] platform/chrome: cros_usbpd_logger: Add __printf
 annotation to append_str()

Hi Enric,

On Tue, Apr 14, 2020 at 10:12:39PM +0200, Enric Balletbo i Serra wrote:
> This allows the compiler to verify the format strings vs the types of
> the arguments. Also, silence the warning (triggered by W=1):
> 
>   cros_usbpd_logger.c:55:2: warning: function ‘append_str’ might be a
>   candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>

Applied for chrome-platform-5.8. You'll find it in the for-kernelci branch
very shortly.

Benson
> ---
> 
>  drivers/platform/chrome/cros_usbpd_logger.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/platform/chrome/cros_usbpd_logger.c b/drivers/platform/chrome/cros_usbpd_logger.c
> index 7de3ea75ef46..d16931203d82 100644
> --- a/drivers/platform/chrome/cros_usbpd_logger.c
> +++ b/drivers/platform/chrome/cros_usbpd_logger.c
> @@ -46,6 +46,7 @@ static const char * const fault_names[] = {
>  	"---", "OCP", "fast OCP", "OVP", "Discharge"
>  };
>  
> +__printf(3, 4)
>  static int append_str(char *buf, int pos, const char *fmt, ...)
>  {
>  	va_list args;
> -- 
> 2.25.1
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org

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