linux-kernel - Re: [PATCH] staging: fieldbus: anybuss: force address space conversion

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Date:   Tue, 21 May 2019 17:42:41 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: fieldbus: anybuss: force address space
 conversion

On Tue, May 21, 2019 at 11:19:59AM -0400, Sven Van Asbroeck wrote:
> On Tue, May 21, 2019 at 11:13 AM Dan Carpenter <dan.carpenter@...cle.com> wrote:
> >
> > There is no need to use __force.  Just:
> >
> >         void __iomem *base = (void __iomem *)context;
> >
> > For the rest as well.
> 
> Yes, that appears to work for 'void *' -> __iomem, but not the other way around:
> 
> +       return devm_regmap_init(dev, NULL, (void *)base, &regmap_cfg);
> 
> sparse generates:
> drivers/staging/fieldbus/anybuss/arcx-anybus.c:156:16: warning: cast
> removes address space of expression
> 
> Would it be a ok solution to use __force in this instance only?

Ick, if you are using __force, almost always something is wrong.

thanks

greg k-h