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

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Date:	Mon, 28 Jun 2010 17:15:11 +0400
From:	Kulikov Vasiliy <segooon@...il.com>
To:	Dan Carpenter <error27@...il.com>, 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 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.
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