linux-kernel - Re: [PATCH] usb: musb: add printf attribute to log function

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Date:   Tue, 22 Dec 2020 09:52:14 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     trix@...hat.com
Cc:     b-liu@...com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: musb: add printf attribute to log function

On Mon, Dec 21, 2020 at 08:25:47AM -0800, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
> 
> Attributing the function allows the compiler to more thoroughly
> check the use of the function with -Wformat and similar flags.
> 
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  drivers/usb/musb/musb_debug.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/musb/musb_debug.h b/drivers/usb/musb/musb_debug.h
> index e5b3506c7b3f..dfc0d02695fa 100644
> --- a/drivers/usb/musb/musb_debug.h
> +++ b/drivers/usb/musb/musb_debug.h
> @@ -17,6 +17,7 @@
>  #define INFO(fmt, args...) yprintk(KERN_INFO, fmt, ## args)
>  #define ERR(fmt, args...) yprintk(KERN_ERR, fmt, ## args)
>  
> +__printf(2, 3)
>  void musb_dbg(struct musb *musb, const char *fmt, ...);

While I understand the need for this, did this find any problems?  If
not, then it's not worth adding, the driver-specific debugging macros
should be removed entirely and just use dev_dbg() and friends instead.

thanks,

greg k-h