linux-kernel - Re: [PATCH 03/24] n_hdlc: convert debuglevel use to pr

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Date:   Thu, 20 Feb 2020 13:45:23 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/24] n_hdlc: convert debuglevel use to pr_debug

On Wed, Feb 19, 2020 at 04:20:33AM -0800, Joe Perches wrote:
> On Wed, 2020-02-19 at 09:40 +0100, Jiri Slaby wrote:
> > With pr_debug we have a fine-grained control about debugging prints. So
> > convert the use of global debuglevel variable and tests to a commonly
> > used pr_debug. And drop debuglevel completely.
> > 
> > This also implicitly adds a loglevel to the messages (KERN_DEBUG) as it
> > was missing on most of them.
> []
> > diff --git a/drivers/tty/n_hdlc.c b/drivers/tty/n_hdlc.c
> []
> > @@ -310,11 +306,9 @@ static int n_hdlc_tty_open (struct tty_struct *tty)
> >  {
> >  	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
> >  
> > -	if (debuglevel >= DEBUG_LEVEL_INFO)	
> > -		printk("%s(%d)n_hdlc_tty_open() called (device=%s)\n",
> > -		__FILE__,__LINE__,
> > -		tty->name);
> > -		
> > +	pr_debug("%s(%d)%s() called (device=%s)\n",
> > +			__FILE__, __LINE__, __func__, tty->name);
> 
> Perhaps remove all the __FILE__ and __LINE__ arguments as
> dynamic debug could emit module and __LINE__ when necessary.

That can be a set of follow-on patches.  This patch is fine as-is for
now.

thanks,

greg k-h