linux-kernel - Re: [PATCH v3 01/19] dlb2: add skeleton for DLB 2.0 driver

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Date:   Thu, 10 Sep 2020 19:00:01 +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 v3 01/19] dlb2: add skeleton for DLB 2.0 driver

On Thu, Sep 10, 2020 at 04:52:37PM +0000, Eads, Gage wrote:
> 
> 
> > -----Original Message-----
> > From: Greg KH <gregkh@...uxfoundation.org>
> > Sent: Thursday, September 10, 2020 11:32 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 v3 01/19] dlb2: add skeleton for DLB 2.0 driver
> > 
> > On Thu, Sep 10, 2020 at 04:24:31PM +0000, Eads, Gage wrote:
> > >
> > >
> > > > -----Original Message-----
> > > > From: Greg KH <gregkh@...uxfoundation.org>
> > > > Sent: Monday, September 7, 2020 8:02 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 v3 01/19] dlb2: add skeleton for DLB 2.0 driver
> > > >
> > > > On Tue, Sep 01, 2020 at 02:15:30PM -0500, Gage Eads wrote:
> > > > > --- /dev/null
> > > > > +++ b/drivers/misc/dlb2/dlb2_main.c
> > > > > @@ -0,0 +1,208 @@
> > > > > +// SPDX-License-Identifier: GPL-2.0-only
> > > > > +/* Copyright(c) 2018-2020 Intel Corporation */
> > > > > +
> > > > > +#include <linux/aer.h>
> > > > > +#include <linux/cdev.h>
> > > > > +#include <linux/delay.h>
> > > > > +#include <linux/fs.h>
> > > > > +#include <linux/init.h>
> > > > > +#include <linux/list.h>
> > > > > +#include <linux/module.h>
> > > > > +#include <linux/pci.h>
> > > > > +#include <linux/uaccess.h>
> > > > > +
> > > > > +#include "dlb2_main.h"
> > > > > +
> > > > > +static const char
> > > > > +dlb2_driver_copyright[] = "Copyright(c) 2018-2020 Intel Corporation";
> > > >
> > > > Why have this in a string and then:
> > > >
> > > > > +MODULE_LICENSE("GPL v2");
> > > > > +MODULE_AUTHOR("Copyright(c) 2018-2020 Intel Corporation");
> > > >
> > > > Not use it?
> > > >
> > > > It's probably not needed at all, right?
> > > >
> > > > Don't you get a build warning about this when applying and building this
> > > > patch?
> > > >
> > > > thanks,
> > > >
> > > > greg k-h
> > >
> > > dlb2_driver_copyright was used in a pr_info() in the v1 patchset that was
> > > removed at Arnd's recommendation, and I forgot to remove the string.
> > Will fix.
> > > The unused warning variable was likely missed in the deluge of warnings
> > from
> > > included kernel headers.
> > 
> > You should not have any build warnings.  If you do, then something is
> > really wrong, the kernel builds cleanly today.
> > 
> > thanks,
> > 
> > greg k-h
> 
> Sorry, I worded that ambiguously. The driver builds without any warnings with
> my GCC (7.3.1) by default. The deluge from kernel headers only occurs after
> adding EXTRA_CFLAGS=-W. There shouldn't be any dlb2 warnings with -W enabled,
> but I'll double check.

You do know about "W=1", right?