linux-kernel - Re: [PATCH] coccinelle: api: add devm_platform_ioremap

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Date:   Sat, 6 Apr 2019 08:34:11 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Himanshu Jha <himanshujha199640@...il.com>
cc:     yamada.masahiro@...ionext.com,
        Gilles Muller <Gilles.Muller@...6.fr>, nicolas.palix@...g.fr,
        michal.lkml@...kovi.net, linux-kernel@...r.kernel.org,
        cocci@...teme.lip6.fr, bgolaszewski@...libre.com,
        gregkh@...uxfoundation.org, andriy.shevchenko@...ux.intel.com,
        linus.walleij@...aro.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] coccinelle: api: add devm_platform_ioremap_resource
 script



On Sat, 6 Apr 2019, Julia Lawall wrote:

>
>
> On Sat, 6 Apr 2019, Himanshu Jha wrote:
>
> > Use recently introduced devm_platform_ioremap_resource
> > helper which wraps platform_get_resource() and
> > devm_ioremap_resource() together. This helps produce much
> > cleaner code while removing local `struct resource` declaration.
> >
> > Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>
>
> Acked-by: Julia Lawall <julia.lawall@...6.fr>
>
> Thanks for taking up this issue.

Maybe this should be

Signed-off-by: Julia Lawall <julia.lawall@...6.fr>

since I contributed two lines to the script :)

julia

>
> julia
>
> > ---
> >
> > Tree wide changes has been tested through 0-day test service
> > with build success.
> >
> > BUILD SUCCESS 74ebaaca5d14d3d9b03e911f0b4995b78a4d60f0
> > tree/branch: https://github.com/himanshujha199640/linux-next  20190401-devm_platform_ioremap_resource-final
> > branch HEAD: 74ebaaca5d14d3d9b03e911f0b4995b78a4d60f0  Coccinelle: api: Add devm_platform_ioremap_resource.cocci
> >
> > elapsed time: 385m
> > configs tested: 162
> >
> >
> > Stats:
> > 916 files changed, 1028 insertions(+), 2921 deletions(-)
> >
> > Note: cases where the `struct resource *res` variable is
> > used subsequently in the function have been ignored out because
> > those cases produce:
> >
> > eg., drivers/bus/da8xx-mstpri.c
> >
> > warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
> >
> > due to:
> > 	if (prio_descr->reg + sizeof(u32) > resource_size(res)) {
> >
> > which seems correct as `res` isn't initialized in the scope of
> > the function(da8xx_mstpri_probe) and instead initialized inside:
> >
> >    void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
> >                                                 unsigned int index)
> >    {
> >            struct resource *res;
> >
> >            res = platform_get_resource(pdev, IORESOURCE_MEM, index);
> >            return devm_ioremap_resource(&pdev->dev, res);
> >    }
> >    EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
> >
> >
> >  .../api/devm_platform_ioremap_resource.cocci  | 63 +++++++++++++++++++
> >  1 file changed, 63 insertions(+)
> >  create mode 100644 scripts/coccinelle/api/devm_platform_ioremap_resource.cocci
> >
> > diff --git a/scripts/coccinelle/api/devm_platform_ioremap_resource.cocci b/scripts/coccinelle/api/devm_platform_ioremap_resource.cocci
> > new file mode 100644
> > index 000000000000..a28274af14df
> > --- /dev/null
> > +++ b/scripts/coccinelle/api/devm_platform_ioremap_resource.cocci
> > @@ -0,0 +1,63 @@
> > +/// Use devm_platform_ioremap_resource helper which wraps
> > +/// platform_get_resource() and devm_ioremap_resource() together.
> > +///
> > +// Confidence: High
> > +// Copyright: (C) 2019 Himanshu Jha GPLv2.
> > +// Copyright: (C) 2019 Julia Lawall, Inria/LIP6. GPLv2.
> > +// Keywords: platform_get_resource, devm_ioremap_resource,
> > +// Keywords: devm_platform_ioremap_resource
> > +
> > +virtual patch
> > +virtual report
> > +
> > +@r depends on patch && !report@
> > +expression e1, e2, arg1, arg2, arg3, arg4;
> > +identifier id;
> > +@@
> > +
> > +(
> > +- id = platform_get_resource(arg1, arg2, arg3);
> > +|
> > +- struct resource *id = platform_get_resource(arg1, arg2, arg3);
> > +)
> > +  ... when != id
> > +- e1 = devm_ioremap_resource(arg4, id);
> > ++ e1 = devm_platform_ioremap_resource(arg1, arg3);
> > +  ... when != id
> > +? id = e2
> > +
> > +@r1 depends on patch && !report@
> > +identifier r.id;
> > +type T;
> > +@@
> > +
> > +- T *id;
> > +  ...when != id
> > +
> > +// ----------------------------------------------------------------------------
> > +
> > +@r2 depends on report && !patch@
> > +identifier id;
> > +expression e1, e2, arg1, arg2, arg3, arg4;
> > +position j0;
> > +@@
> > +
> > +(
> > +  id = platform_get_resource(arg1, arg2, arg3);
> > +|
> > +  struct resource *id = platform_get_resource(arg1, arg2, arg3);
> > +)
> > +  ... when != id
> > +  e1@j0 = devm_ioremap_resource(arg4, id);
> > +  ... when != id
> > +? id = e2
> > +
> > +// ----------------------------------------------------------------------------
> > +
> > +@...ipt:python depends on report && !patch@
> > +e1 << r2.e1;
> > +j0 << r2.j0;
> > +@@
> > +
> > +msg = "WARNING: Use devm_platform_ioremap_resource for %s" % (e1)
> > +coccilib.report.print_report(j0[0], msg)
> > --
> > 2.17.1
> >
> >
>