linux-kernel - Re: [PATCH] staging: fbtft: Use ARRAY

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Date:   Sat, 29 Oct 2022 09:32:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Deepak R Varma <drv@...lo.com>
Cc:     outreachy@...ts.linux.dev, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: fbtft: Use ARRAY_SIZE() to get argument count

On Fri, Oct 28, 2022 at 07:00:05PM +0530, Deepak R Varma wrote:
> The ARRAY_SIZE(foo) macro should be preferred over sizeof operator
> based computation such as sizeof(foo)/sizeof(foo[0]) for finding
> number of elements in an array. Issue identified using coccicheck.
> 
> Signed-off-by: Deepak R Varma <drv@...lo.com>
> ---
>  drivers/staging/fbtft/fbtft.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/fbtft/fbtft.h b/drivers/staging/fbtft/fbtft.h
> index 2c2b5f1c1df3..5506a473be91 100644
> --- a/drivers/staging/fbtft/fbtft.h
> +++ b/drivers/staging/fbtft/fbtft.h
> @@ -231,7 +231,7 @@ struct fbtft_par {
>  	bool polarity;
>  };
> 
> -#define NUMARGS(...)  (sizeof((int[]){__VA_ARGS__}) / sizeof(int))
> +#define NUMARGS(...)  ARRAY_SIZE(((int[]){ __VA_ARGS__ }))

Please please please test-build your patches before sending them out.
To not do so just wastes reviewer resources :(

thanks,

greg k-h