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

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Date:   Wed, 22 Nov 2017 18:21:34 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Joe Perches <joe@...ches.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        netdev@...r.kernel.org, Julia Lawall <julia.lawall@...6.fr>,
        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 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.

It could be possible.  It's a bit tricky due to ifdefs that Coccinelle
doesn't see and header files, but perhaps in special cases like this there
is not much worry.

julia

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