linux-kernel - Re: linux-next: build warning after merge of the char-misc tree

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Message-ID: <20150403140510.GA12376@kroah.com>
Date:	Fri, 3 Apr 2015 16:05:10 +0200
From:	Greg KH <greg@...ah.com>
To:	Fabian Frederick <fabf@...net.be>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org
Subject: Re: linux-next: build warning after merge of the char-misc tree

On Tue, Mar 31, 2015 at 09:35:45PM +0200, Fabian Frederick wrote:
> 
> 
> > On 27 March 2015 at 08:48 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> >
> > Hi all,
> >
> > After merging the char-misc tree, today's linux-next build (powerpc
> > allyesconfig) produced this warning:
> >
> > In file included from include/linux/module.h:17:0,
> >                  from drivers/uio/uio_pdrv_genirq.c:21:
> > include/linux/moduleparam.h:326:22: warning: initialization discards 'const'
> > qualifier from pointer target type
> >   static const struct kparam_string __param_string_##name  \
> >                       ^
> > drivers/uio/uio_pdrv_genirq.c:260:1: note: in expansion of macro
> > 'module_param_string'
> >  module_param_string(of_id, uio_of_genirq_match[0].compatible, 128, 0);
> >  ^
> >
> > Introduced by commit 4d8beff2ae07 ("uio: constify of_device_id array").
> 
> Hi Stephen,
> 
> Absolutely, my patch is wrong ; comment below explains struct is filled
> afterwards.Sorry.
> Greg, should I send you a revert or maybe we could standardize that driver ? (it
> seems it's the only one to work that way).
> 
> static const struct of_device_id uio_of_genirq_match[] = {
>         { /* This is filled with module_parm */ },
>         { /* Sentinel */ },
> };

A revert would be great, and then work to fix it "correctly" so we can
make it constant would be wonderful.  But I don't know how you would do
that at first glance.

I'll just go revert the patch now, thanks.

thanks,

greg k-h
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