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

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Date:	Tue, 20 Dec 2011 16:19:42 +0100
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
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 Geert,

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 ?

> >  };
> > 
> > 
> > diff --git a/drivers/video/matrox/matroxfb_crtc2.c
> > b/drivers/video/matrox/matroxfb_crtc2.c index d7112c3..d0c1abc 100644
> > --- a/drivers/video/matrox/matroxfb_crtc2.c
> > +++ b/drivers/video/matrox/matroxfb_crtc2.c
> > @@ -593,7 +593,7 @@ static struct fb_var_screeninfo matroxfb_dh_defined =
> > { 39721L,48L,16L,33L,10L,
> >                96L,2,0,        /* no sync info */
> >                FB_VMODE_NONINTERLACED,
> > -               0, {0,0,0,0,0}
> > +               0, 0, {0,0,0,0}
> 
> Same here.
> 
> >  };
> > 
> >  static int matroxfb_dh_regit(const struct matrox_fb_info *minfo,

-- 
Regards,

Laurent Pinchart
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