linux-kernel - Re: [PATCH 15/16] trivial: use ARRAY

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Date:	Mon, 28 Jun 2010 15:24:53 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Kulikov Vasiliy <segooon@...il.com>
Cc:	trivial@...nel.org,
	Kernel Janitors <kernel-janitors@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Henk de Groot <pe1dnn@...at.org>,
	Joe Perches <joe@...ches.com>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/16] trivial: use ARRAY_SIZE

On Mon, Jun 28, 2010 at 05:15:11PM +0400, Kulikov Vasiliy wrote:
> On Mon, Jun 28, 2010 at 14:52 +0200, Dan Carpenter wrote:
> > On Mon, Jun 28, 2010 at 03:55:41PM +0400, Kulikov Vasiliy wrote:
> > > Change sizeof(x) / sizeof(*x) to ARRAY_SIZE(x).
> > > 
> > > Signed-off-by: Kulikov Vasiliy <segooon@...il.com>
> > > ---
> > >  drivers/staging/wlags49_h2/hcf.c |    2 +-
> > >  1 files changed, 1 insertions(+), 1 deletions(-)
> > > 
> > > diff --git a/drivers/staging/wlags49_h2/hcf.c b/drivers/staging/wlags49_h2/hcf.c
> > > index 390628c..c4fe0ec 100644
> > > --- a/drivers/staging/wlags49_h2/hcf.c
> > > +++ b/drivers/staging/wlags49_h2/hcf.c
> > > @@ -502,7 +502,7 @@ HCF_STATIC hcf_16* BASED xxxx[ ] = {
> > >  #endif // MSF_COMPONENT_ID
> > >  	NULL									//endsentinel
> > >    };
> > > -#define xxxx_PRI_IDENTITY_OFFSET	(sizeof(xxxx)/sizeof(xxxx[0]) - 3)
> > > +#define xxxx_PRI_IDENTITY_OFFSET	(ARRAY_SIZE(xxxx) - 3)
> > >  
> > 
> > I would say the more critical problem with this macro is that it doesn't
> > work unless you name all your arrays "xxxx[]" so it encourages sub par
> > variable names.
> > 
> > You could do:
> > #define PRI_IDENTITY_OFFSET(x) (ARRAY_SIZE(x) - 3)
> 
> Look at the patch:
> 
> > > @@ -502,7 +502,7 @@ HCF_STATIC hcf_16* BASED xxxx[ ] = {
> There is an array called 'xxxx' and macro xxxx_PRI_IDENTITY_OFFSET is defined
> after array definition. This magic macroconstant is used in the code to get
> elements of xxxx.

Right right.  But xxxx is a stupid name for a variable.  I wanted to
poke my eyes out with a fork.

Not your fault obviously.  Your patch doesn't make it worse so I'm fine
with it as far as it goes...

regards,
dan carpenter
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