linux-kernel - Re: [PATCH 8/9] video: fbdev: aty: use c99 initializers in structures

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Date:	Sat, 23 Aug 2014 09:03:14 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	Paul Mackerras <paulus@...ba.org>, kernel-janitors@...r.kernel.org,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/9] video: fbdev: aty: use c99 initializers in structures

On Sat, Aug 23, 2014 at 05:32:37PM +0200, Julia Lawall wrote:
> On Sat, 23 Aug 2014, Josh Triplett wrote:
> > On Sat, Aug 23, 2014 at 01:20:30PM +0200, Julia Lawall wrote:
> > > From: Julia Lawall <Julia.Lawall@...6.fr>
> > > 
> > > Use c99 initializers for structures.
> > > 
> > > A simplified version of the semantic match that finds this problem is as
> > > follows: (http://coccinelle.lip6.fr/)
> > > 
> > > // <smpl>
> > > @decl@
> > > identifier i1,fld;
> > > type T;
> > > field list[n] fs;
> > > @@
> > > 
> > > struct i1 {
> > >  fs
> > >  T fld;
> > >  ...};
> > > 
> > > @bad@
> > > identifier decl.i1,i2;
> > > expression e;
> > > initializer list[decl.n] is;
> > > @@
> > > 
> > > struct i1 i2 = { is,
> > > + .fld = e
> > > - e
> > >  ,...};
> > > // </smpl>
> > > 
> > > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> > 
> > One comment below about formatting.  With that addressed:
> > Reviewed-by: Josh Triplett <josh@...htriplett.org>
> > 
> > > --- a/drivers/video/fbdev/aty/aty128fb.c
> > > +++ b/drivers/video/fbdev/aty/aty128fb.c
> > > @@ -324,14 +324,57 @@ struct aty128_meminfo {
> > >  };
> > >  
> > >  /* various memory configurations */
> > > -static const struct aty128_meminfo sdr_128   =
> > > -	{ 4, 4, 3, 3, 1, 3, 1, 16, 30, 16, "128-bit SDR SGRAM (1:1)" };
> > > -static const struct aty128_meminfo sdr_64    =
> > > -	{ 4, 8, 3, 3, 1, 3, 1, 17, 46, 17, "64-bit SDR SGRAM (1:1)" };
> > > -static const struct aty128_meminfo sdr_sgram =
> > > -	{ 4, 4, 1, 2, 1, 2, 1, 16, 24, 16, "64-bit SDR SGRAM (2:1)" };
> > > -static const struct aty128_meminfo ddr_sgram =
> > > -	{ 4, 4, 3, 3, 2, 3, 1, 16, 31, 16, "64-bit DDR SGRAM" };
> > > +static const struct aty128_meminfo sdr_128 = {
> > > +	.ML = 4,
> > > +	.MB = 4,
> > > +	.Trcd = 3,
> > > +	.Trp = 3,
> > > +	.Twr = 1,
> > > +	.CL = 3,
> > > +	.Tr2w = 1,
> > > +	.LoopLatency = 16,
> > > +	.DspOn = 30,
> > > +	.Rloop = 16,
> > > +	.name = "128-bit SDR SGRAM (1:1)" };
> > 
> > The closing brace should be in column 0 of the next line.  Also, the
> > final field initializer should have a comma after it. (Likewise for the
> > remaining changes in this file.)
> 
> In general, I haven't changed the presence or absence of trailing commas.  
> Should I add them everywhere?

In general, I'd suggest using trailing commas; they make the initializer
order no longer matter, and avoid the need to patch the last line if
adding another initializer.  However, I wouldn't suggest going out of
your way to change existing initializers, just adding them as part of
initializers you're changing already.

- Josh Triplett
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