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

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Message-ID: <CAMuHMdVx+T8X3tkP+OVM-sxKLeJdsuz=0jBSxuNte_5JK4vTBQ@mail.gmail.com>
Date:	Tue, 20 Dec 2011 16:24:30 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	linux-fbdev@...r.kernel.org, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: linux-next: build warning after merge of the fbdev tree

Hi Laurent,

On Tue, Dec 20, 2011 at 16:19, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> On Tuesday 20 December 2011 14:48:33 Geert Uytterhoeven wrote:
>> On Tue, Dec 20, 2011 at 11:37, Laurent Pinchart wrote:
>> > On Tuesday 20 December 2011 06:32:14 Stephen Rothwell wrote:
>> >> After merging the fbdev tree, today's linux-next build (powerpc
>> >> ppc64_defconfig) produced this warning:
>> >>
>> >> drivers/video/matrox/matroxfb_base.c:150:2: warning: braces around
>> >> scalar initializer [enabled by default]
>> >> drivers/video/matrox/matroxfb_base.c:150:2: warning: (near
>> >> initialization for 'vesafb_defined.colorspace') [enabled by default]
>> >> drivers/video/matrox/matroxfb_base.c:150:2: warning: excess elements in
>> >> scalar initializer [enabled by default]
>> >> drivers/video/matrox/matroxfb_base.c:150:2: warning: (near
>> >> initialization for 'vesafb_defined.colorspace') [enabled by default]
>> >> drivers/video/matrox/matroxfb_crtc2.c:596:3: warning: braces around
>> >> scalar initializer [enabled by default]
>> >> drivers/video/matrox/matroxfb_crtc2.c:596:3: warning: (near
>> >> initialization for 'matroxfb_dh_defined.colorspace') [enabled by
>> >> default]
>> >> drivers/video/matrox/matroxfb_crtc2.c:596:3: warning: excess elements in
>> >> scalar initializer [enabled by default]
>> >> drivers/video/matrox/matroxfb_crtc2.c:596:3: warning: (near
>> >> initialization for 'matroxfb_dh_defined.colorspace') [enabled by
>> >> default]
>> >>
>> >> Introduced by commit fb21c2f42879 ("fbdev: Add FOURCC-based format
>> >> configuration API").
>> >
>> > The following patch should fix the issue. Florian, are you fine with it,
>> > or would you rather modify the initializers to be name-based ?
>> >
>> > From 078987fc14dba806fc1bc628e3e5c371db3cf1b8 Mon Sep 17 00:00:00 2001
>> > From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>> > Date: Tue, 20 Dec 2011 11:30:53 +0100
>> > Subject: [PATCH] fbdev: matroxfb: Fix compilation after fb_var_screeninfo
>> > change
>> >
>> > Commit fb21c2f42879 ("fbdev: Add FOURCC-based format configuration API")
>> > modified the layout of the fb_var_screeninfo structure. Update the
>> > static initializers in the matroxfb driver accordingly.
>> >
>> > Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>> > ---
>> >  drivers/video/matrox/matroxfb_base.c  |    2 +-
>> >  drivers/video/matrox/matroxfb_crtc2.c |    2 +-
>> >  2 files changed, 2 insertions(+), 2 deletions(-)
>> >
>> > diff --git a/drivers/video/matrox/matroxfb_base.c
>> > b/drivers/video/matrox/matroxfb_base.c index 44bf8d4..f98aad5 100644
>> > --- a/drivers/video/matrox/matroxfb_base.c
>> > +++ b/drivers/video/matrox/matroxfb_base.c
>> > @@ -147,7 +147,7 @@ static struct fb_var_screeninfo vesafb_defined = {
>> >        39721L,48L,16L,33L,10L,
>> >        96L,2L,~0,      /* No sync info */
>> >        FB_VMODE_NONINTERLACED,
>> > -       0, {0,0,0,0,0}
>> > +       0, 0, {0,0,0,0}
>>
>> All these zeroes should not be specified, the compiler will do the
>> right thing for
>> static variables anyway.
>>
>> Else they have to be updated manually everytime one of the reserved fields
>> is consumed for a new feature.
>
> I agree. Should I just remove them, or switch the structures to named
> initializers while I'm at it ?

I would just remove them. What do they buy you?

Even with named initializers

    .reserved = { 0, 0, 0, 0 }

will break once we consume one more reserved field, unless you write

    .reserved = { 0, }

to let the compiler handle it, but then you could just not specify the
field at all.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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