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

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Date:	Tue, 20 Dec 2011 16:48:52 +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 16:42, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> On Tuesday 20 December 2011 16:24:30 Geert Uytterhoeven wrote:
>> On Tue, Dec 20, 2011 at 16:19, Laurent Pinchart 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.
>
> Sure. In both cases I would remove them, but I was wondering if I should
> switch the whole structure to named initializers in addition to removing them.
> I don't know if the common practice to solve issues in the -next tree is to
> apply patches that are as little intrusive as possible, or if bigger patches
> are allowed.

I'd fix the build error first.
The conversion to named initializers can be separate cleanup patch.

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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