netdev - Re: [Outreachy kernel] Re: [PATCH] net: usb: hso.c: remove unneeded DRIVER

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Date:   Thu, 23 Nov 2017 08:31:43 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     Joe Perches <joe@...ches.com>, netdev@...r.kernel.org,
        cocci <cocci@...teme.lip6.fr>, outreachy-kernel@...glegroups.com,
        "David S. Miller" <davem@...emloft.net>,
        Andreas Kemnade <andreas@...nade.info>,
        Johan Hovold <johan@...nel.org>, linux-kernel@...r.kernel.org,
        Philippe Ombredanne <pombredanne@...b.com>,
        linux-usb@...r.kernel.org
Subject: Re: [Outreachy kernel] Re: [PATCH] net: usb: hso.c: remove unneeded
 DRIVER_LICENSE #define



On Thu, 23 Nov 2017, Greg Kroah-Hartman wrote:

> On Wed, Nov 22, 2017 at 10:20:49PM +0100, Julia Lawall wrote:
> >
> >
> > On Wed, 22 Nov 2017, Joe Perches wrote:
> >
> > > On Fri, 2017-11-17 at 15:19 +0100, Greg Kroah-Hartman wrote:
> > > > There is no need to #define the license of the driver, just put it in
> > > > the MODULE_LICENSE() line directly as a text string.
> > > >
> > > > This allows tools that check that the module license matches the source
> > > > code license to work properly, as there is no need to unwind the
> > > > unneeded dereference.
> > > []
> > > > diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
> > > []
> > > > @@ -76,7 +76,6 @@
> > > >
> > > >  #define MOD_AUTHOR			"Option Wireless"
> > > >  #define MOD_DESCRIPTION			"USB High Speed Option driver"
> > > > -#define MOD_LICENSE			"GPL"
> > > >
> > > >  #define HSO_MAX_NET_DEVICES		10
> > > >  #define HSO__MAX_MTU			2048
> > > > @@ -3288,7 +3287,7 @@ module_exit(hso_exit);
> > > >
> > > >  MODULE_AUTHOR(MOD_AUTHOR);
> > > >  MODULE_DESCRIPTION(MOD_DESCRIPTION);
> > > > -MODULE_LICENSE(MOD_LICENSE);
> > > > +MODULE_LICENSE("GPL");
> > >
> > > Probably all of these MODULE_<FOO>(MOD_<BAR>) uses could be
> > > simplified as well.
> > >
> > > Perhaps there's utility in a (cocci?) script that looks for
> > > used-once
> > > macro #defines in various types of macros.
> >
> > What about module_version, eg:
> >
> > diff -u -p a/drivers/ata/pata_pdc202xx_old.c
> > b/drivers/ata/pata_pdc202xx_old.c
> > --- a/drivers/ata/pata_pdc202xx_old.c
> > +++ b/drivers/ata/pata_pdc202xx_old.c
> > @@ -21,7 +21,6 @@
> >  #include <linux/libata.h>
> >
> >  #define DRV_NAME "pata_pdc202xx_old"
> > -#define DRV_VERSION "0.4.3"
> >
> >  static int pdc2026x_cable_detect(struct ata_port *ap)
> >  {
> > @@ -389,4 +388,4 @@ MODULE_AUTHOR("Alan Cox");
> >  MODULE_DESCRIPTION("low-level driver for Promise 2024x and 20262-20267");
> >  MODULE_LICENSE("GPL");
> >  MODULE_DEVICE_TABLE(pci, pdc202xx);
> > -MODULE_VERSION(DRV_VERSION);
> > +MODULE_VERSION("0.4.3");
>
> I've just deleted MODULE_VERSION() entirely from some subsystems, as
> once the driver is in the kernel source tree, the "version" makes almost
> no sense at all.
>
> But I know some companies love incrementing it (some network and scsi
> drivers specifically), so those might want to keep it around for some
> odd reason.

OK, that seems like a simple soluton.  Thanks.

julia