linux-kernel - Re: [PATCH 6/9] nbd: Restructure debugging prints

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Date:	Fri, 13 Feb 2015 10:58:50 +0100
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Joe Perches <joe@...ches.com>
Cc:	nbd-general@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] nbd: Restructure debugging prints

On Thu, Feb 12, 2015 at 01:08:48PM -0800, Joe Perches wrote:
> On Thu, 2015-02-12 at 21:57 +0100, Markus Pargmann wrote:
> > dprintk has some name collisions with other frameworks and drivers. It
> > is also not necessary to have these custom debug print filters. Dynamic
> > debug offers the same amount of filtered debugging.
> > 
> > This patch replaces all dprintks with dev_dbg(). It also removes the
> > ioctl dprintk which prints the ingoing ioctls which should be
> > replaceable by strace or similar stuff.
> 
> Perhaps add
> 
> #define nbd_dbg(nbd, fmt, ...)					\
> 	dev_dbg(disk_to_dev((nbd)->disk), "%s: " fmt,		\
> 		nbd->disk->disk_name, ##__VA_ARGS__)

I am not really happy with those custom debug print macros. What do you
think about an inline function 'nbd_to_dev' instead?

> 
> (or function with %pV)
> 
> > diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> []
> > +static void nbd_end_request(struct nbd_device *nbd, struct request *req)
> >  {
> >  	int error = req->errors ? -EIO : 0;
> >  	struct request_queue *q = req->q;
> >  	unsigned long flags;
> >  
> > -	dprintk(DBG_BLKDEV, "%s: request %p: %s\n", req->rq_disk->disk_name,
> > -			req, error ? "failed" : "done");
> > +	dev_dbg(disk_to_dev(nbd->disk), "%s: request %p: %s\n",
> > +		req->rq_disk->disk_name, req, error ? "failed" : "done");
> 
> so this becomes
> 
> 	nbd_dbg(nbd, "request %p: %s\n",
> 		req, error ? "failed" : "done");

so this would be:
 	nbd_dbg(nbd_to_dev(nbd), "request %p: %s\n",
 		req, error ? "failed" : "done");

Best regards,

Markus

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