linux-kernel - Re: [PATCH] PTR

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Message-Id: <20070910010318.971bcfff.akpm@linux-foundation.org>
Date:	Mon, 10 Sep 2007 01:03:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PTR_ALIGN

On Thu, 23 Aug 2007 05:47:03 -0600 Matthew Wilcox <matthew@....cx> wrote:

> 
> The AdvanSys driver wants to align some pointers, and the ALIGN macro
> doesn't work for pointers.  Rather than try to make it work, add a new
> PTR_ALIGN macro which is typesafe.
> 
> Signed-off-by: Matthew Wilcox <matthew@....cx>
> 
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index f592df7..47160fe 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -34,6 +34,7 @@ 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 PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
>  
>  #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
>  

I'll plan on getting this thing of beauty into mainline in the next week or
so, so you can get those advansys changes into James's tree.

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