linux-kernel - Re: [PATCH] scripts/coccinelle/api/gpiod_get_index.cocci: use gpiod

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Date:   Sun, 11 Jun 2017 16:36:55 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
cc:     kernel-janitors@...r.kernel.org,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Michal Marek <mmarek@...e.com>, cocci@...teme.lip6.fr,
        linux-kernel@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        linux-iio@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
Subject: Re: [PATCH] scripts/coccinelle/api/gpiod_get_index.cocci: use
 gpiod_get variant when possible



On Sun, 11 Jun 2017, Andy Shevchenko wrote:

> On Sun, 2017-06-11 at 15:53 +0200, Julia Lawall wrote:
> > Coccinelle script to use the shorter gpiod_get function when the third
> > argument to a gpiod_get_index function is 0.
> >
> > This rule avoids modifying wrapper functions and cases where there is
> > a
> > series of gpiod_get_index calls.
>
> Thanks for the script.
>
> One caution nevertheless (I'm not an expert in coccinelle below, so,
> can't tell if it's already there):
>
> If there are two calls to gpio_get_index() with different indices, we
> are not going to replace the one which uses 0.

It's halfway there.  I assume that the second call would come afterwards,
ie one would naturally put 0 first.  Checking before too could make the
script a bit expensive.  A warning message is emitted about the issue.

julia

>
> >
> > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> >
> > ---
> >  scripts/coccinelle/api/gpiod_get_index.cocci |   92
> > +++++++++++++++++++++++++++
> >  1 file changed, 92 insertions(+)
> >
> > diff --git a/scripts/coccinelle/api/gpiod_get_index.cocci
> > b/scripts/coccinelle/api/gpiod_get_index.cocci
> > new file mode 100644
> > index 0000000..a670a29
> > --- /dev/null
> > +++ b/scripts/coccinelle/api/gpiod_get_index.cocci
> > @@ -0,0 +1,92 @@
> > +/// Use the shorter gpiod_get function when the third argument to a
> > +/// gpiod_get_index function is 0.
> > +//# The change might not be desired when there is a series of calls,
> > for 0, 1,
> > +//# 2, etc.  This rule checks for another such call subsequently
> > only.
> > +///
> > +// Confidence: Moderate
> > +// Copyright: (C) 2017 Julia Lawall, Inria. GPLv2.
> > +// URL: http://coccinelle.lip6.fr/
> > +// Options: --no-includes --include-headers
> > +// Keywords: gpiod_get_index
> > +
> > +virtual patch
> > +virtual context
> > +virtual org
> > +virtual report
> > +
> > +@...tialize:python@
> > +@@
> > +
> > +def not_wrapper(p):
> > +  return (p[0].current_element != "devm_gpiod_get_optional" and
> > +          p[0].current_element != "devm_gpiod_get" and
> > +          p[0].current_element != "gpiod_get_optional" and
> > +          p[0].current_element != "gpiod_get");
> > +
> > +@r depends on patch && !context && !org && !report@
> > +expression e1,e2,e3,e4,e5,e6,n != 0;
> > +position p : script:python() { not_wrapper(p) };
> > +@@
> > +
> > +(
> > +- devm_gpiod_get_index_optional@p
> > ++ devm_gpiod_get_optional
> > +|
> > +- devm_gpiod_get_index@p
> > ++ devm_gpiod_get
> > +|
> > +- gpiod_get_index_optional@p
> > ++ gpiod_get_optional
> > +|
> > +- gpiod_get_index@p
> > ++ gpiod_get
> > +)
> > +   (e1,e2,
> > +-   0,
> > +    e3)
> > + ... when != devm_gpiod_get_index_optional(e4,e5,n,e6)
> > +     when != devm_gpiod_get_index(e4,e5,n,e6)
> > +     when != gpiod_get_index_optional(e4,e5,n,e6)
> > +     when != gpiod_get_index(e4,e5,n,e6)
> > +
> > +// ------------------------------------------------------------------
> > ----------
> > +
> > +@...ontext depends on !patch && (context || org || report) forall@
> > +expression e1, e2, e3, e4, e5, e6, n != 0;
> > +position p: script:python () { not_wrapper(p) };
> > +@@
> > +
> > +(
> > +*  devm_gpiod_get_index_optional@p
> > +|
> > +*  devm_gpiod_get_index@p
> > +|
> > +*  gpiod_get_index_optional@p
> > +|
> > +*  gpiod_get_index@p
> > +)
> > +   (e1,e2,
> > +*    0,
> > +    e3)
> > + ... when != devm_gpiod_get_index_optional(e4,e5,n,e6)
> > +     when != devm_gpiod_get_index(e4,e5,n,e6)
> > +     when != gpiod_get_index_optional(e4,e5,n,e6)
> > +     when != gpiod_get_index(e4,e5,n,e6)
> > +
> > +// ------------------------------------------------------------------
> > ----------
> > +
> > +@...ipt:python r_org depends on org@
> > +p << r_context.p;
> > +@@
> > +
> > +msg = "Use non _index variant in 0 case."
> > +coccilib.org.print_todo(p[0], msg)
> > +
> > +// ------------------------------------------------------------------
> > ----------
> > +
> > +@...ipt:python r_report depends on report@
> > +p << r_context.p;
> > +@@
> > +
> > +msg = "Use non _index variant in 0 case around line %s." %
> > (p[0].line)
> > +coccilib.report.print_report(p[0], msg)
> >
>
> --
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Intel Finland Oy
> --
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