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Subject: Re: [PATCH] scripts/coccinelle/api/gpiod_get_index.cocci: use
 gpiod_get variant when possible
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: kernel-janitors@vger.kernel.org, Gilles Muller <Gilles.Muller@lip6.fr>,
 Nicolas Palix <nicolas.palix@imag.fr>, Michal Marek <mmarek@suse.com>,
 cocci@systeme.lip6.fr,  linux-kernel@vger.kernel.org, Jonathan Cameron
 <jic23@kernel.org>,  linux-iio@vger.kernel.org, Hartmut Knaack
 <knaack.h@gmx.de>, Lars-Peter Clausen <lars@metafoo.de>, Peter
 Meerwald-Stadler <pmeerw@pmeerw.net>
Date: Sun, 11 Jun 2017 17:28:32 +0300
In-Reply-To: <1497189236-4666-1-git-send-email-Julia.Lawall@lip6.fr>
References: <1497189236-4666-1-git-send-email-Julia.Lawall@lip6.fr>
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List-ID: <linux-iio@vger.kernel.org>

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.

> 
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.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
> +
> +@initialize: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)
> +
> +// ------------------------------------------------------------------
> ----------
> +
> +@r_context 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)
> +
> +// ------------------------------------------------------------------
> ----------
> +
> +@script: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)
> +
> +// ------------------------------------------------------------------
> ----------
> +
> +@script: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@linux.intel.com>
Intel Finland Oy