linux-kernel - Re: [PATCH 0/1] Input: inline macros for MODULE

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Date:   Tue, 26 Dec 2017 18:56:34 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Joe Perches <joe@...ches.com>
cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-input@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 0/1] Input: inline macros for MODULE_LICENSE, etc



On Tue, 26 Dec 2017, Joe Perches wrote:

> On Tue, 2017-12-26 at 18:05 +0100, Julia Lawall wrote:
> > Inline macro for MODULE_LICENSE to make the license information easy to
> > find, eg with grep.  Inline the other module-related macros at the same
> > time.
> >
> > The complete semantic patch is as follows: (http://coccinelle.lip6.fr/)
> >
> > // <smpl>
> > @q@
> > declarer name MODULE_LICENSE;
> > identifier i;
> > constant c;
> > position p;
> > @@
> >
> > MODULE_LICENSE(c@i@p);
> >
> > @r depends on q@
> > declarer name MODULE_AUTHOR, MODULE_DESCRIPTION, MODULE_VERSION;
> > identifier i;
> > constant c;
> > position p;
> > @@
> >
> > (
> > MODULE_AUTHOR(c@i@p);
> > >
> >
> > MODULE_DESCRIPTION(c@i@p);
> > >
> >
> > MODULE_LICENSE(c@i@p);
> > >
> >
> > MODULE_VERSION(c@i@p);
> > )
> >
> > @other@
> > identifier r.i;
> > position p != r.p;
> > @@
> >
> > i@p
> >
> > @s depends on !other@
> > identifier r.i;
> > expression e;
> > @@
> >
> > #define i e
> >
> > @@
> > identifier r.i;
> > position r.p;
> > expression s.e;
> > @@
> >
> > (
> > MODULE_AUTHOR(
> > - i@p
> > + e
> >  );
> > >
> >
> > MODULE_DESCRIPTION(
> > - i@p
> > + e
> >  );
> > >
> >
> > MODULE_LICENSE(
> > - i@p
> > + e
> >  );
> > >
> >
> > MODULE_VERSION(
> > - i@p
> > + e
> >  );
> > )
> >
> > @@
> > identifier r.i;
> > expression s.e;
> > @@
> >
> > -#define i e
> > // </smpl>
>
> What assures that the #define is only used by
> MODULE_<FOO> and is not used in any other way?

These two rules:

@other@
identifier r.i;
position p != r.p;
@@

i@p

@s depends on !other@
identifier r.i;
expression e;
@@

#define i e

The first rule checks for uses that are different than the one in the
MODULE_XXX call.  The second rule only matches the #define if the first
rule fails, ie there are no other uses.

julia