linux-kernel - Re: [Cocci] [PATCH] Coccinelle: api: Add SmPL script “use_devm_platform_get_and_ioremap_resource.cocci”

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Date:   Mon, 7 Sep 2020 14:00:19 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Markus Elfring <Markus.Elfring@....de>
cc:     Coccinelle <cocci@...teme.lip6.fr>,
        Dejin Zheng <zhengdejin5@...il.com>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Cocci] [PATCH] Coccinelle: api: Add SmPL script “use_devm_platform_get_and_ioremap_resource.cocci”

On Mon, 7 Sep 2020, Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Mon, 7 Sep 2020 13:14:44 +0200
>
> Another wrapper function is available since the commit 890cc39a879906b63912482dfc41944579df2dc6
> ("drivers: provide devm_platform_get_and_ioremap_resource()").
> Provide design options for the adjustment of affected source code
> by the means of the semantic patch language (Coccinelle software).
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  ...vm_platform_get_and_ioremap_resource.cocci | 71 +++++++++++++++++++
>  1 file changed, 71 insertions(+)
>  create mode 100644 scripts/coccinelle/api/use_devm_platform_get_and_ioremap_resource.cocci
>
> diff --git a/scripts/coccinelle/api/use_devm_platform_get_and_ioremap_resource.cocci b/scripts/coccinelle/api/use_devm_platform_get_and_ioremap_resource.cocci
> new file mode 100644
> index 000000000000..8e67359f6b76
> --- /dev/null
> +++ b/scripts/coccinelle/api/use_devm_platform_get_and_ioremap_resource.cocci
> @@ -0,0 +1,71 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/// Simplify a function call combination by using a known wrapper function.
> +//
> +// Keywords: wrapper function conversion ioremap resources
> +// Confidence: High
> +
> +virtual context, patch, report, org
> +
> +@...play depends on context@
> +expression base, device1, device2, index, private, resource;
> +@@
> +(
> +*resource = platform_get_resource(device1, IORESOURCE_MEM, index);
> + base =
> +*       devm_ioremap_resource
> +                             (&device1->dev, resource);

Why do you require these statements to be next to each other?

> +|
> +*private->res = platform_get_resource(device1, IORESOURCE_MEM, index);
> + base =
> +*       devm_ioremap_resource
> +                             (device2, private->res);

Why do you have this special case?

> +)
> +
> +@...lacement depends on patch@
> +expression base, device1, device2, index, private, resource;
> +@@
> +(
> +-resource = platform_get_resource(device1, IORESOURCE_MEM, index);
> + base =
> +-       devm_ioremap_resource
> ++       devm_platform_get_and_ioremap_resource
> +                             (
> +-                             &
> +                               device1
> +-                                     ->dev
> +                              ,
> +-                             resource
> ++                             index, &resource
> +                             );
> +|
> +-private->res = platform_get_resource(device1, IORESOURCE_MEM, index);
> + base =
> +-       devm_ioremap_resource
> ++       devm_platform_get_and_ioremap_resource
> +                             (device2,

It is very suspicious that in one case you change the first argument of
devm_platform_get_and_ioremap_resource and in one case you don't.  If you
don't know how to make the change in some cases, it would be better to do
nothing at all.

julia

> +-                             private->res
> ++                             index, &private->res
> +                             );
> +)
> +
> +@or depends on org || report@
> +expression base, device1, device2, index, private, resource;
> +position p;
> +@@
> +(
> + resource = platform_get_resource(device1, IORESOURCE_MEM, index);
> + base = devm_ioremap_resource@p(&device1->dev, resource);
> +|
> + private->res = platform_get_resource(device1, IORESOURCE_MEM, index);
> + base = devm_ioremap_resource@p(device2, private->res);
> +)
> +
> +@...ipt:python to_do depends on org@
> +p << or.p;
> +@@
> +coccilib.org.print_todo(p[0], "WARNING: opportunity for devm_platform_get_and_ioremap_resource()")
> +
> +@...ipt:python reporting depends on report@
> +p << or.p;
> +@@
> +coccilib.report.print_report(p[0], "WARNING: opportunity for devm_platform_get_and_ioremap_resource()")
> --
> 2.28.0
>
> _______________________________________________
> Cocci mailing list
> Cocci@...teme.lip6.fr
> https://systeme.lip6.fr/mailman/listinfo/cocci
>

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