linux-kernel - Re: [PATCH] Coccinelle: api: Add SmPL script “use_devm_platform_get_and_ioremap

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Date:   Mon, 7 Sep 2020 16:18:56 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Markus Elfring <Markus.Elfring@....de>
cc:     Dejin Zheng <zhengdejin5@...il.com>,
        Coccinelle <cocci@...teme.lip6.fr>,
        Denis Efremov <efremov@...ux.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: [PATCH] Coccinelle: api: Add SmPL script “use_devm_platform_get_and_ioremap_resource.cocci”



On Mon, 7 Sep 2020, Markus Elfring wrote:

> >>>>>> +@...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,
> …
> >> Both source code change patterns from these branches of a SmPL disjunction
> >> work as I would expect it by the current Coccinelle software.
> >> Would you like to clarify any remaining related open issues?
> >
> > In one case the first argument of devm_ioremap_resource has to be changed
> > to produce the first argument of devm_platform_get_and_ioremap_resource
> > and in the other case there is no such change.  "work as I would expect"
> > is not a proper explanation of why this is correct.
>
> Would like to achieve that a SmPL script (like the one which I present here)
> can help to adjust the implementation of the functions “mvebu_sei_probe”
> and “hi655x_pmic_probe” (for example) for the desired reuse of the wrapper
> function “devm_platform_get_and_ioremap_resource”?
>
>
> > Maybe you can point to some previous commits that have made the change in this way.

I looked at some of the provided examples, but none of them leaves the
first argument of devm_ioremap_resource unchanged.

julia

>
> Not yet for these source code examples.
>
> Some patches were contributed.
> https://lore.kernel.org/patchwork/project/lkml/list/?q=devm_platform_get_and_ioremap_resource&archive=both&state=*
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/?qt=grep&q=devm_platform_get_and_ioremap_resource
>
> Regards,
> Markus
>