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

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Message-ID: <20061126210612.GD6807@wohnheim.fh-wedel.de>
Date:	Sun, 26 Nov 2006 22:06:12 +0100
From:	Jörn Engel <joern@...nheim.fh-wedel.de>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Linus Torvalds <torvalds@...l.org>, Andrew Morton <akpm@...l.org>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, openib-general@...nib.org,
	tom@...ngridcomputing.com, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

On Sun, 26 November 2006 12:26:08 -0800, Roland Dreier wrote:
> 
>  > +#define ALIGN(x,a)		__ALIGN_MASK(x,(typeof(x))(a)-1)
>  > +#define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
> 
> Fine by me, but it loses the extra (typeof(x)) cast that Al wanted to
> make sure that the result of ALIGN() is not wider than x.

Not a big deal, is it?

#define ALIGN(x,a)		(typeof(x))__ALIGN_MASK(x,(typeof(x))(a)-1)
#define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))

Jörn

-- 
Don't worry about people stealing your ideas. If your ideas are any good,
you'll have to ram them down people's throats.
-- Howard Aiken quoted by Ken Iverson quoted by Jim Horning quoted by
   Raph Levien, 1979
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