linux-kernel - Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

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Message-Id: <20061124.220746.57445336.davem@davemloft.net>
Date:	Fri, 24 Nov 2006 22:07:46 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rdreier@...co.com
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org,
	openib-general@...nib.org, tom@...ngridcomputing.com
Subject: Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

From: Roland Dreier <rdreier@...co.com>
Date: Fri, 24 Nov 2006 21:40:14 -0800

> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 24b6111..cc542d3 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -31,7 +31,7 @@ #define ULLONG_MAX	(~0ULL)
>  #define STACK_MAGIC	0xdeadbeef
>  
>  #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
> -#define ALIGN(x,a) (((x)+(a)-1UL)&~((a)-1UL))
> +#define ALIGN(x,a) (((x)+(a)-1L)&~((a)-1L))

Perhaps a better way to fix this is to use
typeof() like other similar macros do.
-
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