linux-kernel - Re: [PATCH] Use more gcc extensions in the Linux headers

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Date:	Fri, 9 Mar 2007 09:50:56 +0300
From:	Andrey Panin <pazke@...pac.ru>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Use more gcc extensions in the Linux headers

On 068, 03 09, 2007 at 04:56:32PM +1100, Rusty Russell wrote:
> __builtin_types_compatible_p() has been around since gcc 2.95,

but it's not available in Intel C compiler IIRC :(

> and we don't use it anywhere.  This patch quietly fixes that.
>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> diff -r f0ff8138f993 include/linux/kernel.h
> --- a/include/linux/kernel.h	Fri Mar 09 16:40:25 2007 +1100
> +++ b/include/linux/kernel.h	Fri Mar 09 16:44:04 2007 +1100
> @@ -35,7 +35,9 @@ extern const char linux_proc_banner[];
>  #define ALIGN(x,a)		__ALIGN_MASK(x,(typeof(x))(a)-1)
>  #define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
>  
> -#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
> +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])			      \
> +	+ sizeof(typeof(int[1 - 2*!!__builtin_types_compatible_p(typeof(arr), \
> +		 typeof(&arr[0]))]))*0)
>  #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
>  #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
>  #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
> 
> 
> -
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-- 
Andrey Panin		| Linux and UNIX system administrator
pazke@...pac.ru		| PGP key: wwwkeys.pgp.net

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