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

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Message-ID: <20100628125224.GJ19184@bicker>
Date:	Mon, 28 Jun 2010 14:52:24 +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 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)

regards,
dan carpenter

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