linux-kernel - Re: [PATCH 01/20] dlb2: add skeleton for DLB 2.0 driver

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Message-ID: <20200718064656.GB245355@kroah.com>
Date:   Sat, 18 Jul 2020 08:46:56 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "Eads, Gage" <gage.eads@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        "Topel, Bjorn" <bjorn.topel@...el.com>
Subject: Re: [PATCH 01/20] dlb2: add skeleton for DLB 2.0 driver

On Fri, Jul 17, 2020 at 06:18:46PM +0000, Eads, Gage wrote:
> 
> 
> > -----Original Message-----
> > From: Greg KH <gregkh@...uxfoundation.org>
> > Sent: Sunday, July 12, 2020 10:58 AM
> > To: Eads, Gage <gage.eads@...el.com>
> > Cc: linux-kernel@...r.kernel.org; arnd@...db.de; Karlsson, Magnus
> > <magnus.karlsson@...el.com>; Topel, Bjorn <bjorn.topel@...el.com>
> > Subject: Re: [PATCH 01/20] dlb2: add skeleton for DLB 2.0 driver
> > 
> > On Sun, Jul 12, 2020 at 08:43:12AM -0500, Gage Eads wrote:
> > > +static int dlb2_probe(struct pci_dev *pdev,
> > > +		      const struct pci_device_id *pdev_id) {
> > > +	struct dlb2_dev *dlb2_dev;
> > > +	int ret;
> > > +
> > > +	dev_dbg(&pdev->dev, "probe\n");
> > 
> > ftrace is your friend.  Remove all of your debugging code now, you don't need
> > it anymore, especially for stuff like this where you didn't even need it in the
> > first place :(
> 
> I'll remove this and other similar dev_dbg() calls. This was an oversight on my part.
> 
> I have other instances that a kprobe can't easily replace, such as printing structure contents, that are useful for tracing the usage of the driver. It looks like other misc drivers use dev_dbg() similarly -- do you consider this an acceptable use of a debug print?

Why can't a kernel tracepoint print a structure?

thanks,

greg k-h