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

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Date:   Mon, 7 Sep 2020 15:46:44 +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>,
        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”

> >>>> +@...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.
> >>
> >> I noticed a few special cases during my source code analysis approach.
> >
> > This is not a reasonable answer.  Does the rule work correctly or not?
> > If it doesn't work correctly, it needs to be removed.
>
> 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.  Maybe you can point
to some previous commits that have made the change in this way.

julia